Amazon Marketplace
Power Supply 230V mains-powered with 9V Alkaline battery back-up Alarm Dimensions - 133 x 133 x 6mm. Bracket Dimensions - 127 x 127 x 39mm. (213g) Combined Test/HushTM button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms Approvals - BSI certified to BS5446 Part 2: 2003. CE tested and certified Warranty - 6 years
AmazonInterlink with up to 23 Firex hard-wired alarms Combined test/hush button Auto reset Tamper-resistant locking device Mains operation, Manufacturer: Kidde