Oxford alarm d max duo lock setoxfords alarm d max lock is a premium quality high security lock with a sold secure silver rating it provides the highest level of security for your bike a 14mm hardened steel shackle accompanied by an uncomfortably loud 120 db alarm effectively deters any would be thieves the alarm d max lock is constructed from high quality materials to provide an extremely high level of protection the weatherproof alarm is powered by a long life lithium battery and has an