Feature:1. When you open or close the door/window, the sensor will immediately push an instant notification to your smartphone.2. Compatible for Google Play, for Andriod and for IOS systems, no hub required, making your house more safer.3. Convenient to detect the status of doors, windows, cabinets, drawers or any location you want to be notified when they are opened or closed.4. There is no need to use complicated tools during installation, just use the attached adhesive stickers to install, more firm and durable.5. The distance between the two openings should be as close as possible and not affect the installation position.6. The sensor needs two AAA batteries (not included). When the battery power is low, automatically send a message to the APP to remind you to replace the battery.Specification:Item Type: WIFI Door SensorMaterial: ABSBattery Type: 2pcs 1.5V AAA battery (not included)Battery Life: More than one year standbyQuiescent Current: 30AEmission Current: 35mAAlarm Output: Warning, low battery prompt, tamper proof, sensor failureWorking Temperature: 0 to 50WiFi: IEEE 802.11 b 2.4GHz.Package List:1 x Sensor1 x Door Magnetic2 x Adhesive Sticker1 x Manual1 x Card Pin