Feature:1. FOR HOME SAFETY: Door and window detector alarm, often used to detect the state of the house, users can view it in real time to ensure the home safety.2. EASY TO INSTALL: Equipped with double sided tape, which can be directly pasted on door and window without other tools and is easy to operate.3. CLOSE INSTALLATION: The arrows on the transmitter and the magnetic strip are in opposite directions, the mount distance should be as close as possible.4. WIFI AND APP CONTROL: Support 2.4GHz WiFi connection, control by for Tuya Smart APP, no need for a hub, the sensor will push instant notifications to smartphone.5. BATTERY POWERED: The sensor requires 2pcs AAA batteries (not included), it automatically pushes a message through the APP when the battery is low.Specification:Item Type: Door Window DetectorBattery: 2 x AAA battery (battery not included)Working Voltage: 3VWorking Temperature: 0-50WIFI: 2.4GHzAPP: For Tuya Smart, for Smart Life.Package List:1 x Ejection Pin2 x Double Sided Tape1 x Transmitter1 x Magnetic Strip