The compact lock from Urban Security is made from stainless steel and is fixed with its 10mm locking bolts onto a section of the disc: standard protection against theft of scooters or motorcycles. In an attempt to break the disc lock, a loud 120db alarm and flashing light are activated. The alarm function can be disabled and the lock can be used as a simple key device for the brake disc. Equipped with a CR2 lithium battery. Spare alarm modules are sold separately.