portable Long life sensor, stable, reliable. General SpecificationDetection GasCarbon monoxideSound alarm95 DB at 0.3 meter distanceOperating Temperature-30~50°CEnvironmental Humidity15%~90% RH (non-condensing)ProtocolMT703-2008Detection capability0-1000 ppmSight alarmRed LEDDimension1200*500 mmWeight0.3 Kg