... rugged ABS+PC case 2. battery operated gas detecotr, infrared alphasense co2 sensor 3. OEM IntroductionWe, Beijing Dashiweiye Tech Co, Ltd ... proceedAlarm waySound, lightContinuous working time>3 months ( without backlight)Sensor lifetime≥2 yearWorking current< 1mA ( without backlight)Battery ... product you want according to your requirement. Infrared co2 detector to test ppm concentration by IR ...