Tracer Products' TP-9364 PRO-Alert 2791 electronic refrigerant leak detector utilizes a state-of-the-art infrared sensor to accurately detect refrigerant leaks down to 0.1oz./year (3 g/year). Its three-position sensitivity switch minimizes false triggering and allows for easy diagnosis of small, medium and large leaks. Powered by a rechargeable NiMH battery, providing over six hours of use between charges. The unit can also be used with an included 120 VAC power adapter and a 12 VDC power adapter with cigarette lighter plug. The sensor life lasts more than 1,000 hours.