This Alarm lock home Combine the lock function with the alarm function to achieve a comprehensive anti-theft, so that you can be more assured, it will protect your wealth from loss. This anti theft lock alarm for home has a built-in siren that triggers an alarm that emits up to 110 decibels of loud sound when locked or shaken, making it ideal for avoiding theft. How to use : 1. Insert the key and pull out the lock beam. 2. after the lock beam rotates 180 degrees, re-insert it into the lock and a drip alarm will sound. 3. Pull out the key and lock it. If someone touches it, an alarm will be sent out. Rugged Waterproof Padlock alarm lock for door is made of high-quality aluminum alloy, alarm lock is corrosion-resistant and waterproof. It has a longer service life than other locks. It is a economical choice for you. Alarm lock and key with multiple uses has Mini appearance, easy to carry, with 2 keys, suitable for most motorcycles, bicycles, containers, doors, sliding doors, windows, etc. Read Less