The Gas Clip Technologies Multi Gas Clip Monitor is the only portable, 4-gas monitor on the market that can be used continuously for 60 days without being recharged. It features a battery that can operate for two months or more on a single charge and uses low-power infrared sensor technology to detect combustible gases (LEL). This allows greater battery range. Shut down the unit nightly and the battery can last up to 4 months. This unit can work in inert environments as the combustible sensor does not need oxygen. Easy to maintain and operate, the Gas Clip MGC also has a 6-month calibration cycle.