1 Pack Smoke Detector Carbon Monoxide Detector Combo Battery Powered,Carbon Monoxide Detector Smoke Alarm with Digital Display,Smoke and Carbon Monoxide Detector for Home,HotelBrand: OLUNCLE Color: White 1 Features: This smoke detector carbon monoxide detector combo is a 2 in 1 carbon monoxide and smoke detector, so you don't need to install them separately Smoke and carbon monoxide detector has a large digital display and is readable. But to save power, the display is not always on. Under normal working state, only the green led light will blink every 60 seconds or so This carbon monoxide and smoke detector features a low