Shackcom Combination Smoke and Carbon Monoxide Detector, 5-Year Battery Smoke Alarm with LCD Display for Home, 3 Pack, White

2-in-1 Protection: Equipped with 2 sensors, a CO sensor and a smoke sensor, this combined detector protects your circle of relatives 24 hours a day from smoke and carbon monoxide.
Loud 85 dB Alarm: Upgraded photoelectric and electrochemical sensors significantly toughen the sensitivity of the alarm, providing a loud and clear warning signal within the event of danger with faster response time, at the same time as minimizing false alarms.
LCD Screen: Display carbon monoxide levels through a very easy to read digital display. The alarm sound pattern is 4 short alarm beeps for CO alarm and 3 long beeps for smoke alarm. The red LED will flash at the same time as in alarm mode.
5-year Battery Powered: The sealed battery allows the unit to observe your house 24/7, and the durable design ensures stable and reliable performance for 5 years without the need for frequent battery replacement. Emits two “chirps” each 30 seconds and the red LED flashes, indicating low battery power and a warning indicating that the unit is about to end use, The alarm must be replaced.
Easy Installation: Package includes installation bracket, screws, and plastic expansion tubes. No rewiring required, easy to put in on any wall or ceiling.