The Auto Watch Can-Bus alarm has been made for many years and is the no 1 choice of alarm for some installers across the UK. The alarm features an in built Can-Bus data base and will automatically select the correct profile for your vehicle once installed. With the battery back up siren and small module this alarm really is a good bit of kit. Offering full Thatcham Cat 2 > 1 approval you may get an insurance discount after installation. This alarm is only suited to Can-Bus vehicles which is around the year of 2005 on wards.