Bemodst Built-in Movement Sensor Security 110db Siren Alarm Lock Universal Anti-Theft Padlock for Bicycle Motorcycle Door Gate Bike Shed Bolt Chain Lock (Black) Great Deterrent - The 110 DBA Siren will emit loud sound when someone tries to unlock move, touch or knock. Alarm Intervals - When you set it up to be an alarm lock and then close the shackle, the alarm sounds in 10 second intervals. Two Kinds Of Usage - The Security Lock can be set to two states, mechanical lock and alarm. Low false alarm rate. Low power consumption. Widely Application - Ideal for door, window, bicycle, container, Caravans, motor bike, tricycle, pull gate, garden, etc. Detail - Material: Zinc alloy, Hot Processed and Hardened Shackle; Size: high 96mm, wide 71mm, thick 32mm, thick shackle 10mm; Package included: 1 x Alarm lock, 3 x Keys, 6 x button batterie.