Keep your bike, garage door, garden shed, side gate, tool box or locker, or anything you desire secure with this Heavy Duty 110dB Siren Alarm Padlock. This innovative U lock comes equipped with two settings, armed and unarmed, so you can be alerted by a 105 - 110 db alarm when the lock is tampered with, basically, double the protection. The Heavy Duty Siren Alarm Padlock has a body made of extra strong cast steel, high-grade steel shackle. It is resistant to corrosion, bad weather, physical destroy & Waterproof. Combines locking function with alarming function. Built-in movement triggered alarm, which can emit loud sound when the lock is hit or shaken. Adopts MCU core procedures, high-tech integrated circuit and digital sensor chip. Can be set to two states: mechanical lock and alarm. Low false alarm rate. Low power consumption. Can be used on door, window, bicycle, container, motor bike, tricycle, pull gate, garden, etc. Corrosion resistant, waterproof and durable to use. Powered by six button batteries. Supplied with three keys, convenient to use. Note: When you place the shackle with groove into lock near key port, then the lock comes into alarming state. When the shackle with groove is placed away from key port, the lock is just in the mechanical lock state. Specifications : Color: Black Material: Zinc Alloy Alarm decibel: 110dB Power: 6 x LR44 button batteries ( Included ) Lock size: 7 x 3.3 x 9.8cm / 2.7 x 1.3 x 3.8in Lock weight: 313g Warranty offered only if purchase thru Indiashop's store.