Function: Bicycle anti theft alarmMaterial: ABS plasticWith A / B / C buttonsProtect your bike from being stolen4 digital password ， only the user can unlock.Adopt micro-computer technique， have high-middle-lower sensitivity choose.Quiver trigger， security and sensitivityLow power consumption to allow the battery a long life.Easy to installation and DIYPower: 1 x 6F22 9V batteryDynamic current: < 100mAAlarm decibel: > 105dbTemperature: - Work: -15 ~ 75 degrees Celsius - Store: -40 ~ 85 degrees CelsiusEnvironment humidity level: 5% ~ 98%Color: BlackDimensions: 160 x 60 x 35 mm:Approved: CE / FCCEPC_OUT_106Operational Guidance:Waterproof， but do not immerse the product into water.Recommend use alkaline 9V battery. If in cold winter， recommend use cold resistance battery. Please replace the battery once the alarm sound lower.If do not use the unit for a long time， please take out the battery， To avoid any damage due to the leak liquid.