Features It will be triggered to alarm when somebody is spying or smashing the locks. 110 high decibel siren alarm, effective deterrent to criminals, Automatically armed after two laps rotation. Padlock with three core high security keys, It can be used alarmed or unalarmed Electromechanical integration control, allround protection, stainless steel shackle, hardened zinc alloy body waterproof, weather resistant, corrosion resistant It makes siren noise when touched or senses vibration. This Lock Alarm is a hardened steel padlock which has an in built alarm which will omit a siren of 110 decibels if touched or tampered with in any way thus alerting you to unwanted attention