Product details:

Visual and audible alarms indicate high/low levels of natural gas Compact size lets you take this detector anywhere. Auto zero calibration Take this pocket-sized monitor with you to check combustible gas concentrations. Operation is simple! Activate the unit in clean air to establish a zero point. The green LED flashes and the unit beeps every seven seconds in a non-alarm status. The yellow LED flashes and the unit beeps every 0.5 second when the gas concentration is between the low and high alarm points. If the gas concentration is above the high alarm point the red and yellow LEDs flash and the unit beeps every 0.5 second. wrist strap and two AA batteries.QUICK DETECTION: Detects natural gas, compressed natural gas, methan (CH4), propane, butane, liquid natural gas (LNG), petroleum gas (LPG).
PRE-CALIBRATED: Gas leak detector comes pre-calibrated; the detection tool is ready for use right on arrival.
COMPACT: Unlike other natural gas leak detectors ours is compact and lightweight and can be taken on the go.