Ideal sensor for areas where there could be CO leaks, such as kitchens, garages, living rooms... 85dB alarm that warns of the risk of carbon monoxide. Cordless feature allows you to install it anywhere in the house with ease Test button. Low battery indicator. Includes a long-lasting 9V battery. Size: 9.6cm in diameter and 3.8cm in width. Weight: 81g With a 5-year warranty.