Black smart panel,cool design,strong function,two way alarm,detector failure report,strong voice prompt,unique design for home ... door unclosed23) Using fixed plate for convenient installation.SPEICIFICATIONMain system:1) Power supply: 9V 2) Back up LI-ionbattery: DC10V ... ) Transmitting signal current: 35mA(2S)Magnetic door sensor (Vibration sensor)1) Power supply: Dry battery: 9 V. 6F22 2) Static ...