SONOFF DW2 Wi-Fi Wireless Door and Window Sensor with Phone Notification Home Security Motion Sensor Burglar Alarm System with App

Note: *SONOFF DW2 doesn't come with batteries into package. *The sensor can work for up to 3 months if the door/window is opened or closed three times a day. *1. The device only works with 2.4GHz WiFi. 2. If the router is working in dual-band (2.4GHz & 5GHz), please upgrade the eWeLink app to V4.0.0 or higher. 3. The pairing will fail if a wrong WiFi password is input. 4. The device shall get close to the smart phone for a good transmission signal condition while pairing. Specifications: Brand: SONOFF Model: DW2 Material: PC Battery Type: 2pcs AAA battery, 1.5V Working Voltage: DC 3V (2 * 1.5V battery) Quiescent Current: = 40µA Emission Current: =15mA Wi-Fi: IEEE 802.11 b 2.4GHz Operating Systems: Android 4.1 or later, iOS 9.0 or later Installation Gap: <5mm Working Temerature: -10?~40? Item Size: 7*3.1*1.9cm / 2.75*1.22*0.74in; 4.2*1.6*1.4cm / 1.65*0.62*0.55in Item Weight: 29g / 1.02oz Package Size: 7*4.8*2cm / 2.75*1.88*0.78in Package Weight: 37g / 1.3oz Packing List: 1 * Door Sensor 1 * Adhesive Tape 1 * User Manual