Marine Triple C Gas Detector- MED - H2S, CO, O2: Single plug-in electrochemical cell Combustible (LEL): Soldered infrared (IR)3 years maintenance freeWorks in completely inert (oxygen free) and Zone 0 (Flammable environments.Approval: MED/SOLASIngress Protection: IP68Warranty: Full 3 years (1095 days continuous based on an average of 90 seconds/day of alarm condition).No Charging needed: Cutting-edge infrared sensor technology means it's immune to sensor poisoning.No Calibration, No Charging, No CostsFrom Zone 0 to inert atmospheres - with the MED/SOLAS TRIPLE-C detector you’re always good to go.Innovative 3-year battery life and cutting-edge infrared technology removes the need to calibrate, meaning no unproductive maintenance breaks and no expensive sensor replacement.This all-in-one solution guarantees compliance and reduces risk whilst saving time and money - all at the touch of a single button