... /EN50291 2.Sound>85dB at 1M 3.AC-DC adapter 4.10-Year battery Smoke & Carbon ... Monoxide AlarmSpecifications : Power Supply: AC-DC adapter ·COMBINED CO, SMOKE ,HEAT and GAS detector ... LED flash ,repeat this alarm pattern) More :DC,AC PoweredBackside2 in 1: Gas and smoke detector, ... 10 year battery ( co alarm with 9V DC operated )smoke and carbon monoxide combination alarm installed in ...