Smart Door and Window Sensor: WiFi Door Sensor for Home Security, App Alerts, Wireless Contact Sensor, Programmable with Smart Life Devices, Compatible with Alexa, Google Assistant (4-Pack)

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. You can use the door sensors to protect liquor & medicine cabinets, gun safes, storage lockers & boxes. Place a sensor on your fridge/freezer door or lid and know if it was left open, to prevent food loss. Specification:App: Smart Life/Tuya SmartMaterial: ABS PlasticColor: WhitePower Supply: DC3V LR302*2(included)Wireless type:WiFi 2.4 GHz (5G is not supported!）Standby Current: ≤10uALow power undervoltage:≤2.4VWorking Temperature: -10°C ~ 50°C（14℉-122℉）Size: 72*25*20mm/2.83*0.98*078inches

• FREE APP ALERTS FOR PEACE OF MIND: No hub required; The window door contact sensor is controlled by Tuya Smart App or Smart Life App. An alert notification will automatic send to you once the sensor triggered; A must have security system accessories
• VOICE CONTROL: The Smart door sensor is compatible with Alexa, Simply give a voice command to check if your door is open or close, such as "Alexa , is the front door open?"
• SMART HOME AUTOMATION: You can set a condition in the smart scene, Automatically turn on your smart wall switches or lights when door opened; or the air conditioner in your room is turned off once your window is open. More smart devices can be sync as long as they compatible with Smart Life app.
• SMART SECURITY SENSOR: All alarm record history can be check in app; 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
• INSTALLS IN MOMENTS: The door alarm comes with 2 AAA batteries, metal screws and 3M tape, which make it possible to use directly when you received the package. Just scan the sensor's QR code, give it a name, peel off the 3M mounting tape, press the sensor and magnet to the door and frame, and you have added security to your home or business!