Reduce your risk of home fires with the PROSiXCOMBO Two-Way Wireless Smoke/Heat/CO Detector. With the “One-Go-All-Go” feature, if one sensor detects smoke, heat or carbon monoxide, and begins to sound, all sensors in the system will sound. The PROSiXCOMBO detector also gives audible instructions that can support multiple languages. A prominent, 360° viewable LED shows visual alerts. Multi-color LEDs intuitively indicate alarm and CO conditions. Sophisticated and trusted algorithms interpret and respond to conditions - cutting down on false alarms.