... battery LCD display electrochemical sensor,more accurate Independent digital carbon monoxide detector alarm 1. Power supply: 4.5V battery2. ... Alarm current: less than 50 mA5. Sensors: the use of innovative electrochemical carbon monoxide sensor,more accurate,more reliable,and good ... the standby mode, rapid blinking indicates that the carbon monoxide incidents7. High-volume buzzer output:up to 85dB ...