With this smoke/carbon monoxide detector, you can always detect the concentration of smoke/carbon monoxide to keep you and your family safe. Features: Smoke and Carbon Monoxide Detector provides excellent security, emitting an audible alarm (75dB) when it detects a buildup of smoke or carbon monoxide, and instantly alerts those in danger, ensuring the safety of personal life. Built-in high precision electrochemical sensor and infrared photoelectric sensor, high stability and sensitivity, reduce false alarms. Low current consumption, long standby life, powered by 3 AA batteries (not included), low battery message.< /p> Alarm concentration: Bright display 50PPM; 150PPM alarm. Combined carbon monoxide and smoke alarm, one alarm can be installed where two were previously required. Reduce installation time and help keep home decor attractive. Specifications: Item Name: Smoke/Carbon Monoxide Alarm Material: ABS Color: White Static Current: