XUEMEI Anti-Theft Alarm LockSensitive motion vibration sensor activates the alarm when it vibrates. Sound up to 110 decibels. Dual reinforced, high-safety discs, 7mm diameter cylinders, fit most motorcycles and bikes with disc brakes. Easy to use and widely usedPress to lock - It is easy to lock by pressing the locking mechanism, and the brake lock immediately enters the alarm mode. 7mm pin brake disc alarm lock is suitable for most types of vehicles: motorcycles, electric cars, bicycles, scooters, etc. Practical Disc LockUsing an alloy aluminum body, it is sealed and waterproof, so you don't have to worry about rainy days. And 6 internal batteries to replace when they run out. COMPLETE ACCESSORIESThe package comes with a 1.5m orange disc lock reminder cable to remind you to remove the disc lock to prevent potential damage from cycling while the disc lock is engaged. , 6 extra batteries for longer life. And there are 2 keys. Size: 8.7*6cm Colour: Black Packing list: 1pcs