We protect our most valuable possessions with an alarm system, here is how to do it for your bike. Hardened 12mm round shackle The shackle, the body and the load-bearing parts of the locking mechanism are manufactured using specially hardened steel Special, modern design of the lock body casing allows for optimum handling High-quality locking cylinder for high protection against manipulation, e.g., picking Alarm at a volume of at least 100 dB for 15 seconds, followed by automatic reactivation 3D Position Detection – detects vibrations and the smallest of movements in all three dimensions and triggers an alarm CR2 batteries included Attributes Bracket USH Lock Type Key Primary Color Black Thickness In mm 12mm