Combination Smoke and Carbon Monoxide Detector 1: The product combines the functions of CO and smoke alarm detection. It is manufactured by SMT process. The design is simple and exquisite, and the technology is full. The internal configuration is highly sensitive. The dual sensor intelligently detects multiple gases, sound and light alarm/LED indication alarm, low current. Consumption, long standby life, low battery prompts, full-featured. 2: ABS fireproof engineering plastics 3: Uses: carbon monoxide and smoke detectors, alarms Features: 1.2 in 1 Carbon Monoxide+Smoke Detector 2.Adopt high reliability electrochemical sensor and infrared photoelectric sensor 3.LED liquid crystal display density 4.Carbon monoxide gas detection concentration: 000-999ppm 5.Smoke sensitivity: 0.1% db/m-9.9% db/m 6.Power: 3 AA1.5V batteries (Not included) 7.Low current consumption, long standby life 8.Battery low battery prompt 9.Alarm memory function 10.Alarm pause (silent mode) 11.Double warning :Sound and light alarm / LED indication alarm 12.Sound Alarm:100db 13.SMT industrial manufacturing, strong stability 14.Size: 104mm (diameter) * 35mm (height) 15.Material: plastic 16.Color: White 17.Smoke detector protection area: When the space height is 6 meters to 12 meters, the protection area of one detector is 80 square meters for the general protection site; when the space height is 6 meters or less, the protection area is 60 square meters. 18.Scope: barbecue shop, kitchen, bedroom, living room, parking lot, school, library etc. What is Included 1 x Carbon monoxide smoke composite detector 1 x User's Manual