SNZB-04 Ewelink SNZB-04 is a ZigBee two-in-one wireless door/window sensor that can be put on your door or window to tell you with an alert notification if your door or window is opened or closed, adding an extra layer of security to your home. Remind you when the door/window is open and closed. Sync the opening & closing status of door/window on APP. Can make ZigBee and Wi-Fi devices keep linkage. Control the light with an action Support adding the Ewelink camera to what happened at your home. Share control makes other users control the connected device quickly. 3-month history records check . Low-battery notification. Simple and stick installation. color:White :plastic Package Contents: 1 x Wireless door and window sensor(SNZB-04) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.