Carbon monoxide detector LM 201A certified and tested according to EN 50291. Display with temperature, CO concentration, battery charge level, function monitoring and alarm, as well as three colored LED control lights indicating the status of the CO detector. LED indicator with self-test function, TEST button for gas detector test function, error warning in case of malfunction, warning signal in case of low battery. Early warning system for early warning of different CO concentrations - CO alarm at dangerous CO concentration. Mute the sound in case of false alarm for 5 minutes. Package Contents: 1 x CO Detector Type LM 201A, 3 x 1.5V DC AA Batteries. Effective Detection Gas: Carbon Monoxide Detection Method: Electrochemical Sensor Operating Voltage: 4.5V DC Working Environment: Temperature 0℃ to 45℃ Relative Humidity: 0-90% RH Idle Operating Current: 80 ± 10 uA Alarm Current: 45 ~ 75 mA Alarm Sound Level: > 85 dB (1 m distance) Power Indicator: Flashes once every 45 seconds Fault