Designed for use in all domestic environments such as homes, caravans and boats, especially where space is limited. This two-in-one alarm tests for both carbon monoxide and smoke operating on a 9v battery (included) which can be replaced. Certified to BS EN 14604:2005, BS EN 50291-1:2018, BS EN 50291-2:2019 Powerful 85dB speaker Separate test button of each CO & Smoke function Replaceable 9v Battery included Manufacturer code COS10
