The Renogy ONE Door & Window Sensor can accurately detect the opening and closing of doors and windows. This long-lasting device features a lithium coin battery that is embedded for convenience. Simple installation is possible with the use of a common 3M adhesive. By creating a unique smart scene with the Renogy ONE M1 on your DC Home app, you can achieve multi-scene linkage with other accessories. Your Off-grid Safeguard Ensure the security of your home with Renogy ONE M1 Door & Window sensors, even when you're away exploring! No more worrying about forgetting to secure a door or window. Let Renogy ONE Turn Lights On for You Effortlessly locate light switches in the dark with Renogy ONE M1. Set up a smart scene to automatically turn on lights when the door opens. Easy Installation Effortlessly install sensors in seconds with 3M adhesives for your van conversion project. Package Includes Door & Window Sensor 1 x 3M Adhesive 1 x Specification RENOGY Door & Window Sensor Model: RSHDWZ03P Dimensions (L x W x D): Transmitter: 1.85 x 1.06 x 0.53 in / 47 x 27 x 13.5mmMagnet: 1.26 x 0.61 x 0.51 in / 35 x 15.6 x13mm Connection: Zigbee 3.0 (IEEE 802.15.4) Weight: 0.05 lbs / 21 g Applicable Environment: Indoor Casing Material: PC V0 Color: White Security Mode: WPA / WPA2 Installation Method: 3M adhesive to stick Operating Temperature Range: 14℉ to 104℉/-10℃ to 40℃ Installation Gap: 0.39 in(