Note:Please allow 2-3mm deviation exist due to different measure way，thank you！Description:100% brand new and high quality.Material:Sturdy black plastic - no metal parts to rustColor: BlackPower supply: 1 x 6F22 9V battery (No include)Fit for: Bicycle motorcyle4 digital code，only the user can unlock...Adopt micro-computer technique.have High-Middle-Lower sensitivity choose.Quiver trigged，security and sevisitivityLow power consumption to allow the battery a long life.Easy to installation and DIYWaterproof: attach permanently to your bike without worrying about having to remove it in bad weatherPacking include:1 x Bicycle alarm 3 x Screws 1 x Use Instruction