Combination Smoke and Carbon Monoxide Detector Alarm, Beeps Warning Smoke and CO Alarms for Basements Travel Home Office House Bedroom Living Room Car, Battery Operated,Comply with UL 217/2034, 1-Pack

Keep your family protected with this battery operated smoke and carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO and smoke levels, even supposing there is a power failure(Operated by 2 x 1.5V AA Batteries (not included))
2-in-1 Accurate, Reliable & Highly Sensitive Alarm: Equipped with both photoelectric smoke sensor and electrochemical CO sensor that work independently of each other; every second counts; detects both fast and slow-burning fires, and instantly notifies you when dangerous smoke or CO concentration is detected even as minimizing false alarms; provides the ultimate protection from 2 deadly threats, all contained in 1 unit
Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, even as an 85dB siren provides a clear, loud warning upon detection.
Simple to Use: Test/Silence button enables you to test the alarm weekly, and to easily silence the alarm when false alarms occur; malfunction and low battery warnings will let you easily know the working status of the alarm; in case of an emergency, an alarm tone of over 85 dB will sound all the way through your whole home, instantly alerting all the household, even those in sleep, The unit is of malfunction if the unit sounds at all times, Reinstall the battery to repeat the operation Until normal.
Quick & Easy Installation with Guaranteed Quality: Product Dimensions: 4 * 4 * 1.5 inch, Requires no rewiring; easy to mount on any wall or ceiling with the included mounting bracket, screws and anchor plugs; certified to meet the UL safety standards for your peace of mind and absolute confidence in our product. you’ll get: 1. one detector alarm with Mounting bracket, 2. one manual, 3. two screws.