Velkro Krevia Anti Theft Motion Sensor Alarm Lock For Home, Office And Bikes 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.