Carbon Monoxide Detector, Digital Display Screen Type LCD, Features Adjustable Audible Alarm, Earphone Jack and Earbuds for Loud Environments, Hands Free Operation with Belt Clip Soft Case, Includes Belt Clip, Carrying Case, Earbuds, Hand Strap, Maximum Carbon Monoxide Measured 1,999 ppm, Minimum Carbon Monoxide Measured 0 ppm, PPM Accuracy +/-10 Percent of Reading(+30 to +1999ppm), +/-3ppm (0 to +29ppm), Gases Detected Carbon Monoxide, Power Source Battery, Manufacturer Warranty Length 3 yr