Keep linkage with SONOFF smart devices to create various smart scene<br> Turn on/off your light with an action<br> Notify you when the door/window is opened<br> Check the opening and closing status of door/window on APP<br> Battery-level display and low-battery reminder<br> Allow sharing the sensor with your family to monitor and control of your home<br> No gateway required<br> Bluetooth low energy pairing<br> Support to check history record on APP<br> Low-power Wi-Fi transmission for more lasting work time<br> Peel and stick installation, quick to use<br> Note: SONOFFDW2 is now available for pre-order and shipped on May 20.<br> Specification of SONOFF DW2<br> Battery Model: AAA 1.5V;<br> Working Voltage: DC3V (2 x 1.5V battery);<br> Quiescent current: 40 A;<br> Wi-Fi: IEEE 802.11 b 2.4GHZ;<br> Material: PC V0;<br> Download Center<br> User Manual<br> Specifications:<br> Specification of SONOFF DW2<br> Battery Model: AAA 1.5V;<br> Working Voltage: DC3V (2 x 1.5V battery);<br> Quiescent current: 40 A;<br> Wi-Fi: IEEE 802.11 b 2.4GHZ;<br> Material: PC V0;<br> Download Center<br> User Manual<br> Package Included:<br> 1 x Door And Window Sensor(not include battery)<br> Notes:<br> Due to the difference between different monitors, the pictures may not reflect the actual color of the item.<br> Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement.<br> Please leaving a message before you give the bad feedback,if the products have some problems.<br> Thanks for your understandings.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store