The Alarm-D Pro is a maximum-security U lock which comes with its own easy to fit carry bracket. The Pro model has an upgraded and thicker lock body and combined with a 14mm special hardened steel shackle, the lock comfortably surpasses the Sold Secure Pedal Cycle GOLD standard. It also has a 120db weatherproof movement and shock activated alarm which will scare off any would-be bike thief.The Alarm-D Pro DUO (model LK349) comes with a chunky 1.2 metre looped cable, to help extend its reach and to secure both wheels and frame.The Alarm-D Pro has a key replacement service. When you buy your Alarm-D Pro, simply note down the number which comes attached to the keys on a metal tag. Keep this in a safe place, then in the event that you are unfortunate enough to lose all your keys, it will be possible to get a new key made up for you.Key Features Sold Secure Pedal Cycle GOLD (the alarm component is not part of the Sold Secure approval) Loud weatherproof 120db alarm siren Anti-pick lock mechanism Coated in Vinyl to protect paintwork Replaceable long-life Lithium CR2 battery Includes carry bracket 3 keys supplied 1.2 metre cable included (Duo model only) Two sizes of U lock available Dimensions: 14mm? shackle, 260(h) x 173(w)mm Reviews"Sold Secure Gold rated lock, with a great alarm feature. 4.5/5" - Cycling Weekly"The improvements made by Oxford solidify this locks place as the best bike lock with alarm" - BikeLockWiki.com