The Oxford Products Boss Alarm 16mm Padlock is the strongest lock that Oxford have ever released with an integral alarm. It is ear-splittingly loud with a 100dB alarm triggered by movement sensors. It has been independently tested and approved by Sold Secure and was awarded Motorcycle GOLD standard SBSC, ART 4*, Classe SRA and FG enabling insurance discounts. The removable sealed unit alarm module is vibration-resistant and weather-proof against water, frost and heat and can be used as a disc lock or a padlock. Three keys and replacement key service provided and batteries are included (6 x LR44). Combine with 12mm hardened steel chain to give additional security.