Check the listing for details. NEW Rolson Heavy Duty Alarm Padlock. Condition: New. Listed at 44.90 USD. NEW Rolson Heavy Duty Alarm Padlock BRAND NEW AND SEALED Help keep your valuable posessions safe and secure with the help of this Heavy Duty Alarm Padlock. The alarm is activated if the lock is moved touched or knocked - and you do not even have to have the alarm activated as this padlock can be used while being unalarmed. There is a deep groove on the inside edge on one side of the shackle and when fitted with the groove on the the key port side of the lock the alarm is active. If the shackle is fitted on the other way round the alarm system is inactive. A trusty way to help secure sheds garages motorcycles bicycles trailers lawn mowers tool boxes side gates and garden furniture etc. 100db Twin tone siren alarmed Auto alarm system - will sound for ten seconds if activated Automatic res.