SITERWELL Smoke Detector Carbon Monoxide Detector Combo with Voice Speaker, Dual Sensor Fire and CO Alarm with LED Light & Test Button, Battery Operated, Auto-Check, UL 217 & UL 2034 Standards, 1 Pack
- ...will go into non-disruptive mode, avoiding nighttime alarms and frequent flashes, and you can enjoy approximately 10 hours of silence..
- Self Check Function - The smoke detector carbon monoxide detector combination replaces the manual daily test and automatically checks the batteries and sensors every 80 seconds to ensure they are working properly. You'll be alerted when a malfunction occurs..
- Longer Service Life - Keeps your home safe for up to 10 years. 2 replaceable AA batteries last 3 times longer than 9V batteries. When the combination detector is at the end of its life, an end-of-life signal will let you know when it's time to replace it..