Havey duty locks 1.110db siren,alarm underwater 2.Alarm speaker in ... bottom of padlock body 3.Sturdy,safe,CE&RoHS passed Heavy duty locks, alarm padlock, alarm lock, container alarm padlock, security lock ... siren2.Alarm system.Alarm under water, waterproof .Auto-alarming system & locking system .Can be used alarmed or without alarm .Three tone ...