The Oxford Boss Alarm has been independently tested and approved by: Sold Secure Powered Cycle (Motorcycle) Gold standard, SBSC and FG. As well as being an extremely secure lock, it comes with an ear-splittingly loud 100dB alarm which is triggered by movement sensors; you can also lock it up without setting the alarm. A key replacement service is available 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. Features: Very loud 100dB alarm The removable, sealed unit alarm module is weather-proof against water, frost and heat, as well as vibration-resistant Can be used as a disc lock or a padlock Anti-jack design can withstand 4.5 tonnes of tensile load Batteries Included (6 x LR44) Three keys and a key replacement service provided Also available with 16mm shackle for more extreme security conditions Can be used with a chain to create the perfect chain lock (OF7/8/9)