Smart Door and Window Sensor Real Time Monitor Anti Burglar Wireless Door Open Sensor with APP Notification for Home Item Type: Smart Door and Window SensorMaterial: ABSFunction: Detect if the door is open or closed and push the notification to the phoneBattery Type: Alkaline Battery Battery Model: AA battery (Shipped without batteries) Battery Quantity: 2 Standby Current: 6.5ua Operating Temperature: 0 ℃ ~ 40 ℃ Operating Humidity: 20% ~ 85% Operating Time: 5000 Wireless Frequency: 2.4GHz Wireless Protocol: For Zigbee 3.0, for IEEE 802.15.4 Network Range: Approx. 55m / 180.4ftMain Body Size: Approx. 8 x 4 x 2cm / 3.1 x 1.6 x 0.8in Small Body Size:Approx.8 x 2 x 1cm / 3.1 x 0.8 x 0.4in