The Oxford Boss Alarm Lock and Chainis their strongest ever disc lock, and has the advantage of being a disc lock/chain lock and alarm in one!5 Year life-cycle tested (by Thatcham)Removable, sealed unit alarm moduleWater, vibration, frost and heat-proofBatteries Included (6 x LR44)Free Minder CableThree keys and Key replacement serviceCan be used as a disc lock or padlock100db alarmThe Oxford Boss Alarm Lock and Chain has a removable, sealed unit alarm module and is water, vibration, frost and heat resistant. The high security triple heat-hardened 12mm square link chain is covered by a non-scratch covering.For additional peace of mind the Boss Alarm lock is eligible for Oxford's key replacement service so that if you are unfortunate enough to lose all your keys a new one can be made up. Just remember to take note of your key number and keep this in a safe place.