Smoke and carbon monoxide detectors are shipped based on the color or size of the main image on the product page. With this smoke/carbon monoxide detector, you can track your smoke/carbon monoxide levels to keep you and your family safe. Features: Smoke and carbon monoxide detectors provide excellent security, with an audible alarm (85 dB) when a buildup of smoke or carbon monoxide is detected, and an immediate danger alarm for personal safety. Built-in high-precision electrochemical sensor and infrared photoelectric sensor, high stability and sensitivity. high, reduce false alarms. Low power consumption, long standby life, powered by 3 AA batteries (not included), low battery prompt. Alarm concentration: 50 ppm. The combination of carbon monoxide and smoke detectors allows a single siren to be installed where two were previously required. Reduce installation time and help keep the interior decoration attractive. Specification: Product Name: Smoke/Carbon Monoxide Alarm Material: ABS