Features:100% brand new and high qualitySuitable for home， office indoor use， not for balcony where has insolation or rain.Compact， wireless， easy to install.Low power consumption， lasting one year. Free to change batteries frequently.Powered by 2 pieces of AAA alkaline batteries. (Batteries are not included in the pack.)Low power remind with LED indicatorSuper loud alarm of 105dB， scare thief awayMagnetic sensor， door and window motion detector.Keep the distance between device and magnetic shorter than 10mm， and arrow aims to each other.Make sure one install in door/window， another one install in door/window frame， that to let them separate when the door/window is opening.Password release alarmWorking Temperature: -10 ~ 60°CWorking Humidity: below 80%Package includes:1× Main Device 1× Magnetic