Smart Entry Contact Sensor.

In short, a contact sensor tells you whether something is open or closed.  These sensors let you know when people are entering and leaving your house and can even trigger some actions (turn lights on and off as doors are opened and closed).

Door and window sensors are your first line of defense for home theft; some sensors even detect when a window is broken by an intruder. Also, these sensors alert you to potential intruders. Once again, the wireless technology allows you to receive notifications straight to your phone or tablet and allows you to quickly call for help if needed.

Contact sensors are most often used as part of smart security systems, put on doors and windows. But they're also really useful for knowing if anything has been opened or closed - blinds, mailbox door, fridges, drawers, garage doors, doggie doors, medicine cabinets, you name it. If it opens and closes you can stick a contact sensor on it.

You can use them as standalone devices or pair them with a smart home system like Amazon Alexa, Samsung SmartThings or Apple HomeKit to do useful stuff such as have lights turn on, your alarm system disable, and maybe the TV turn on when you open the front door. 

Typically these sensors consist of two pieces, both easily installed. When in the “closed” position the two pieces of the sensor are in close proximity to each other and when “opened” the pieces are further away. 

You can install contact sensors on doors, one piece on the door jam and the other on the door itself. This gives you the ability to be notified when a door is opened or closed. 

Once you get more advanced you can use this information to trigger additional actions based off of the open and closed status of the door (like turning on the home lights).

Similarly you can use these sensors on windows all throughout the house to stay informed about which windows are open and which are closed. 

Let's see the recommended sensors for this quarter (Q4 2021).

1.- Ring Contact Sensor (2nd Gen).

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Get instant mobile alerts when doors and windows open in your home. Now smaller to enable increased placement options. Easy installation with no tools required. Mounts to door and window frames. Includes two 3V CR2032 batteries Requires the Ring Alarm Base Station. Z-Wave Connectivity (250-foot range to Base Station open air, line of sight). Ring Alarm Kit required. Rating: 4.8 of 14,897 Ratings in Amazon.

2.- SimpliSafe Entry Sensor (Window & Door).

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Fits on all types of doors and windows. Magnet can be placed up to 2" From the sensor. Setup is a snap. Place it on any door or window and 'add device' With your SimpliSafe Keypad. Chimes when your door or window opens letting you know someone is entering. Ready to work right out of the box, your entry sensor comes pre-installed with batteries and adhesive. Compatible with your SimpliSafe home security system. (New generation). Optional installation tools included for your convenience. 2 screws and a Mounting plate. Add up to 100 sensors to the base of your SimpliSafe home security system. (New generation). Rating: 4.7 of 2,557 Ratings in Amazon.

3.- Samsung SmartThings Door & Window Multipurpose Sensor.

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Versatile Monitoring. All-in-one open/close, vibration, orientation, angle (tilt), and temperature sensor for multipurpose functionality. 24/7 Monitoring. Receive instant phone alerts if a door, window, cabinet or drawer opens unexpectedly. Stay Safe. Get a notification if you forgot to close your doors or windows to ensure your home stays safe. Requirements. Must have SmartThings App and SmartThings Hub or compatible device with SmartThings Hub functionality (connected devices sold separately. Compatibility. Works with Google, Amazon Alexa, SmartThings, and Zigbee communication protocols. Rating: 4.5 of 2,383 Ratings in Amazon.

4.- Sengled Smart Window & Door Sensor.

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Simple Set Up. Pair the sensor directly to the Sengled Smart Hub using the Sengled Home app (iOS/Android). A compatible hub is required for use. Simple Installation. Use the in app guide to activate your sensor. Then, peel the backing off the adhesive and stick on any door jamb or window frame. Check In From Anywhere. See the status of your window or door by checking the Sengled Home app (iOS/Android) when connected to a Sengled Smart Hub. Automate your Home. Have your entryway lights turn on when you open the front door automatically. Use the open/close status in the app to trigger other Sengled smart devices, including Sengled Smart LEDs. Keep An Eye Out. Know when your door or window has been opened by checking the timeline in the Sengled Home app. Rating: 4.1 of 1,294 Ratings in Amazon.

5.- Ecolink Door & Window Sensor.

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Compatility. The Ecolink Door/Window is manufacturer tested to be compatible with the following ZWAVE Plus Home Automation HUBs or controllers: Samsung SmartThings Certified, V1, V2, V3. Vera Plus, Vera Edge, Vera Lite. Homeseer. Dlink staples connect. While it may work with your ZWAVE hub, Ecolink cannot guarantee it. Simple to Install. Easy installation by simply pulling the battery Tab to begin the Learning process. Natively compatible with SmartThings, it works with most brands of ZWAVE home security hubs. Features industry leading rare earth magnets that allow for up to a 5/8 inch sensor to magnet gap. Perfect for most door or window applications. White or Brown housings Inluded. Both White or Brown plastic housing choice included to match any décor. 3 Years Battery Life. Tamper sensing Premium design outlasts the competition and boasts a battery Life of up to 3 years. Ecolink is a leading developer of low power, highly reliable wireless solutions, including a wide range of intelligent wireless security, sensing or home automation devices. Rating: 4.5 of 771 Ratings in Amazon.

6.- Aqara Door & Window Sensor.

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Notes. An Aqara Hub is required and sold separately. Requires a secured 2. 4 gigahertz WiFi network connection. The Aqara M2 or M1S Hub can connect up to 128 devices(*use of a repeater such as the Aqara Smart Plug or Aqara Smart Wall Switch(With Neutral) is required). Unauthorized Entry Detection. Whenever the door/window opens unexpectedly, the Aqara Door and Window Sensor will send an alert notification to your phone and activate the local alarm on the Aqara Hub.  Home Automation. The Aqara Door and Window Sensor can control other Aqara connected devices as the status of the door or window changes. 22mm Wide Gap Allowed. The Aqara Door and Window Sensor works with most types of doors, windows, and other fixtures with similar mechanism, such as drawers, cabinets, and more.  Voice Control. Compatible with Apple Home Kit, Alexa for a hands-free experience. In addition, If you have any questions, please feel free to contact us. Rating: 4.5 of 731 Ratings in Amazon.

7.- Lifedcordirect Smart Door & Window Sensor.

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Receive Real-time Alarms Remotely. When door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. so you don't have to worry about your baby going out of house without notice, will easily know when your aged parents leave or arrive home and even can be clear when someone enters your home, etc. Compatible with Google Play, Android and IOS System. No hub required and No fees charge. Convenient for you to detect the status of your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. So you can travel or go to work or go to school or go shopping worry-free. Alert Message Push. Protect your home with open / closed door detection. When the door/window is triggered, you will receive an alarm signal from your phone. Home Security Alarm make House more safety. Easy Installation. No Need to use complicated tools when installation, just use 3M glue to install, firm and durable. The two arrows are opposite, the distance between the two components should be as close as possible and the closest distance should not affect the opening/closing of the door or window. Low Power Warning. The sensor door need with TWO AA Batteries (not include). When the battery level is low, it will automatically push messages through APP to remind you to change battery, never worry about running out of battery. Rating: 3.6 of 543 Ratings in Amazon.

8.- Geeni Smart Door & Window Sensor.

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Smart Home Security Sensors. The Geeni Door & Window Sensor gives peace of mind, anywhere, anytime. Get real time alerts at the exact moment you have an unexpected guest, opened safe or escaped pet. No Hub Required. This smart home door and window sensor system works with your home WIFI (no hub required). Simply download the Geeni app, mount your sensors with the included adhesive or screws, and connect.  Compatibility. The Geeni Door and Window Sensors are only compatible with 2.4GHz Wi-Fi networks. The sensors easily install in any entryway and the wireless design offers flexible placement options. Control from Anywhere. Using your home WIFI, you can set up automated actions with other Geeni Smart Home products such as automatically powering on the lights when a door is opened. Long-Lasting Performance. The Geeni Door and Window Sensors are CR2 battery-powered for a long-lasting performance. You can put your mind at easy knowing that the built-in battery provides continuous operation for up to 2-years. Rating: 3.9 of 502 Ratings in Amazon.

9.- TESSAN Smart Door & Window Contact Sensor.

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Smart Security Sensor. TESSAN door and window alarm sensor is designed to monitor the open or close status of any entrance; An alert notification will automatic send to you in 10 seconds once the sensor triggered; Ideal for front door, window, baby room, garage and more; Door status and battery power can be check in app; No hub required; No extra cost; A must have security system accessories. Programmable Sensor. Extend your smart home automation with TESSAN WIFI door sensor; Set up your smart routines in app; Automatically turn on your smart wall switches or lights when door opened; Automatically turn off your air-condition when window opened; More smart devices can be sync as long as they compatible with Smart Life app; Support 2.4Ghz WIFI only, dual-band (2.4G and 5G) WIFI need to set a separate 2.4G channel. Hand-Free Voice Control. TESSAN WIFI garage sensor is compatible with Amazon Alexa and Google Assistant; Simply give a voice command to check the open or close status instead of going down or picking up your phone; Your voice device will work as chime, siren or alarm when the sensor triggered; Saving your operation time and make your smart home life more convenient and easier. Peace of Mind. All alarm record history can be check in app; The smart window sensor is built-in low consumption module, 2*AAA Alkaline battery provide 1-year monitoring; All the statuses of doors and windows will be displayed simultaneously in the app; Share the device to your families, they can check the status and get notified at the same time. Note. The door sensor itself does not include a chime; However, you can program it to some smart voice devices via Smart Life app; When the sensor triggered open or close, the voice devices will perform as an alarm or bell in 10 seconds. Rating: 3.9 of 465 Ratings in Amazon.

10.- VOCOlinc Door & Window Contact Sensor.

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A Breeze to Automate Your Home (Apple Home Hub Required). Open a door to activate a custom scene, which engages other HomeKit-enabled products, using the Home app on your iPhone/ Apple Watch. Have your house automatically illuminate to greet you on entry, but only after 6 pm. Have your lights turn bright when your baby opens a storage area with potentially dangerous objects. Turn off the air conditioner when you open the windows in your room. Immediate Notifications. Your HomeKit Home will send a notification to your Apple devices when anything equipped with the status of the VS1 changes. Get real-time status via Siri and your iPhone/Apple Watch before you leave your house, or when it is about to rain so that you will never forget to close your doors or windows. Remote access requires an Apple Home Hub. Ultra-low Power Consumption and Snappy Performance. up to 6 months battery life achieved by exclusive energy-saving technology and Bluetooth Low Energy technology (5.0); it uses a CR2032 button battery (included in standard packaging), which can be easily replaced. Advanced Security with Apple HomeKit. "HomeKit-enabled" means personal data is under no circumstances captured, saved to a cloud, or sold to third parties. Even when accessing your home remotely via your Home Hub, all data is encrypted end-to-end and stored on your iPhone. Compact, Thin, and Responsive. Designed to easily fit onto your window frames and doors. Setup is quick and simple. Response time is like a snap of the fingers. Apple Home Hub can be an Apple TV (4th Gen+) or HomPod. Rating: 4.5 of 419 Ratings in Amazon.

11.- SONOFF Door & Window Sensor.

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SONOFF wireless door/window sensor can be put on your door or window to tell you with an alert notification if your door or window is opened or closed, adding an extra layer of security to your home. Both the opening and closing status of the door/window are synced on your mobile phone, no longer to think back whether the door/down is off or not. SONOFF ZigBee Bridge is required. The sensor provides you the possibility to create a scene linkage of ZigBee and Wi-Fi devices. This sensor is able to help you create a smart home. Works with SONOFF ZigBee Bridge in harmony, you can set a scene to get your hallway lighted immediately when the door is opened. Simple installation for easier setup, 3M adhesive (included) installation significantly saves your time. Its application can also extend to wide areas like drawers, garage doors, blinds, etc. Just stick it anywhere two things connect and it is always safe even if you don’t keep watch on it. Share the sensor with your family to give them an ability to quickly control and monitor your home together. 3-month history records check. The camera function can be enabled on the sensor page in the eWeLink APP, which also allows you to view clearly who enters your home; even you can frighten the stranger and ask him to leave your home immediately with the two-way audio. Rating: 3.6 of 284 Ratings in Amazon.

12.- Eve Door & Window Smart Contact Sensor.

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Check your door or window. See the current open/closed state at a glance. Get activity notifications and automatically activate other HomeKit-enabled accessories courtesy of your home hub (HomePod mini, HomePod, or Apple TV). HomeKit-enabled for unparalleled ease of use and advanced security; get up and running in a flash with quick & easy set up and no need for a bridge or gateway. Supports Bluetooth and Thread, and joins your Thread network automatically. Thread requires a HomePod mini as a border router. 100% Privacy. No Eve cloud, no registration, no tracking. Local intelligence and direct communication without bridge or cloud dependency. Our highly professional, multilingual product support team is also based in Germany and ready to assist. Rating: 4.6 of 232 Ratings in Amazon.

13.- Onvis Door & Window Contact Sensor.

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Onvis Door Sensor, Keep Your Home And Family Safe. Onvis door sensor will send you phone alert when there's a on/off state change, reminding you whether the door or window is open or closed, 24/7 door sensor will monitor for home, office, garage, warehouse, and more. Window & Door Sensor For Home Security System. Onivs CT2 smart door sensor works exclusively with Apple HomeKit. Create home automations with other HomeKit enabled accessories. For example, with the front door opened, the hallway lights can be turn on automatically. Never walk in dark again. Low Energy Consumption And Long Standby Time. Onivs homekit door sensor uses bluetooth low energy 5.0 and CR2450 button cell battery, offering low power consumption and 1 year standby time. Excellent quality and seamless installation. Record. Shows detection records over the recent 30 days and can be checked on ONVIS Home App or Apple devices. Flexible Deploying. Additional gaskets, button cell battery and miniature design allows you to deploy the contact sensor flexibly.With the help of Onvis app or Apple Home app,installation can be done in a few minutes. Rating: 4.1 of 210 Ratings in Amazon.

14.- YoLink Smart Home Door & Window Sensor.

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World's Longest Wireless Range. Powered by LoRa technology, the long-range yet low-power system offers the industry’s longest receiving range in the market (1/4 mile). Our long-range coverage enables its use in areas challenging for most residential WIFI systems, such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property. Early-Warning Notifications. Receive real-time early-warning notifications in the form of smartphone banner alerts, limited SMS/text messages, and emails, each optional and configured per your needs; Please note: YoLink Door Sensor does not alarm or chime, it only sends notifications; For an audible alarm, consider our Siren Alarm. Low-Power Means Longer Battery Life. Because of the low power consumption, device batteries may last 5 years or more (depending on application and device usage/activity), on standard AAA Alkaline batteries (lithium batteries not required)!. From Simple to Super-Smart. After setting up your notification preferences, keep it simple and let the YoLink system do the rest and monitor your home and property for you. Or, utilize available advanced automation features, including 3rd-party integration with Alexa and IFTTT, to interact with other YoLink and 3rd-party smart devices. Limited only by your imagination!. Doesn't Work without YoLink Hub. YoLink Hub is the only central controller for YoLink devices, and it connects YoLink devices to the internet and the cloud. Without YoLink Hub, this smart sensor does not work with the YoLink app and does not support 3rd-party integration with Alexa and IFTTT. YoLink Hub is not included, please search B07TQLKQLJ for the hub or try our Door Sensor 2 Pack Kit with 1 Hub B088ZFGX3S. Rating: 4.7 of 196 Ratings in Amazon.

15.- Monoprice Wireless Smart Door & Window Sensor.

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24/7 Remote Monitoring. Tap into your mobile device to monitor the status of the entry points around your home or work place. You can also check the battery life of the sensor. Conveniently review the logs and detection history, in case you missed an alert. Instant Notifications. Be the first to know. Receive instant push notifications and send alerts directly to your mobile devices whenever a protected door or window is opened or closed.  Tampered Alert. The built-in tamper switch provides additional security and sends an alert to you when the sensor is tampered with. Easy Setup and STITCH Installation. Download the free Android or iOS STITCH app, add the device, pair with your home wireless network, and you're done! No hub or gateway is required! Enable scene control and include multiple devices to a preprogrammed group. Applications. Mount the sensor to a door or window to detect when it is opened or closed and receive an instant notification directly to your mobile devices whenever there's a status change. Rating: 3.6 of 188 Ratings in Amazon.

16.- Schlage Window & Door Sensor.

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Check in to see if the doors and windows are closed at night. Allows you to remotely monitor your doors and windows, allowing you to stay in touch and in control. Compatible with any z-wave system. Both white and brown cases are included Rating: 4.0 of 183 Ratings in Amazon.

17.-  iSmartAlarm Sensor.

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Instant notifications. Wireless and moveable. Perfect for doors, windows, cabinets, etc. Ismartalarm accessory in a pack of two sensors. This model is for US and Canada only, and requires an iSmartAlarm CubeOne (hub). Rating: 4.0 of 165 Ratings in Amazon.

18.- Ring Outdoor Sensor (NEW).

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Help secure outdoor gates, sheds, guesthouses, and windows with Ring Alarm Outdoor Contact Sensor. Get mobile alerts when your outdoor gate opens, or set the sensor to automatically trigger your Ring Alarm siren when armed in Home or Away mode. With its weather-resistant design, the Ring Alarm Outdoor Contact Sensor can withstand outdoor use in most climates. Outdoor Contact Sensor comes with mounting tape and screws for easy installation on most surfaces. Power. 2 AA alkaline batteries (included). Requires Ring Alarm or Ring Alarm Pro. Optional 24/7 Professional Monitoring (requires an eligible Ring Protect subscription, sold separately) for Ring Alarm or Ring Alarm Pro. Ring Alarm and the professional monitoring service are available and ship only within the U.S. (excluding territories) and Canada. If you’ve enrolled in Professional Monitoring, you can choose to receive a call from the monitoring center when the Outdoor Contact Sensor is triggered and request emergency assistance if needed. Rating: NEW in Amazon.