Heavy Duty Steel Alarm Padlock. Ideal for Homes, sheds, caravans, gates, bikes, motorcycles etc. Pick resistant keyhole, Batteries not accessible when locked, Padlock measures approx. 122mm (4.75 inches) high Weather proof, Long life batteries included and pre fitted,3 special cut keys ,To set the lock alarm simply remove the shackle, turn it round and push the shackle into the housing and turn the key. The unit will emit a short bleep to indicate that the alarm is activated. If the padlock is disturbed, it will activate the full alarm.