Mengshen Bicycle Motor Bike Cycling Waterproof Anti-theft Burglar Security Alarm Sound Safety Lock 110 db Alarm Black MS-Z05 Environment-Friendly,Waterproof(but do not immerse the product into water)high quality,excellent after-sale service 4 digital code,only the user can unlock Adopt micro-computer thchnique,have High-Middle-Lower sensitivity choose Low power consumption to allow the battery a long life Easy to installation and DIY