The FG100 is a combustible gas leak detector. Detects flammable gases such as liquefied natural gas (LNG) and liquefied propane gas (LPG) at 500 to 6500 PPM. Alarms can be both audible and visual. Convenient compact portable size with pocket clip. Continuous operation for up to four hours. LED indicators of gas leaks and static absorption. Simple one-switch procedure. Comes with two AAA batteries.