Brand Kidde Style Twin Pack Power source Battery Powered Product dimensions 7.5D x 8W x 12.5H centimetres Item weight 400 Grams Sensor type Carbon Monoxide Sensor New Model: Replacement for previous 5CO model Continuous monitoring for CO with a loud alarm on detection Warranty: 7 Year Manufacturer's Warranty Powered by 2 x replaceable AA batteries (included). The alarm will provide an end of life alert to inform you when it needs to be replaced after 10 years of protection Warning "chirp" and LED signal when batteries are low Dimensions (HxWxD): 73 x 127 x 39mm Kitemarked to BS EN 50291-1:2018 (domestic use) | CE marked and UKCA marked