STRONG & WATERPROOF: The brake lock is constructed of forged stainless steel and tungsten carbide, with a carbide reinforced hardened steel locking pin, and the super class B lock cylinder prevents the thief from sawing or cutting. open unduly. Waterproof, sawn-proof, rust-proof and weatherproof, it keeps working in any environment and any place. ANTI-THEFT WITH ALARM: Easy to lock with one push, just press press the button with a "beep" in the alarm state. Up to 110db alarm automatically activates when it detects vibration or shock, keeps your belongings safe and loud enough to scare away thieves. LONG LIFE USE: Each disc lock comes pre-fitted with 6 LR44 batteries, and 6 extra batteries are included in the package for replacement, you can use the supplied Allen key to change the batteries in seconds, or just remove the batteries and use it as a conventional lock without alarm. WIDE RANGE OF APPLICATIONS: Suitable for the majority of motorcycles and motorcycles with disc brakes, where the brake rotor is less than 7 mm thick and is transversely drilled. Also suitable for most scooters, cruisers, choppers, sport bikes and racing bikes.