The Superior Signals VPE-GN Gooseneck is designed to quickly pinpoint a variety of hard-to-find leaks in a vehicle including refrigerant leaks in air conditioning systems, vacuum leaks, and window and door seal leaks. It features a 9-1/2" flexible gooseneck probe that runs conveniently off a standard 9V battery. The VPE-GN Gooseneck detects the ultrasonic noise generated by a leak and translates it into a sound the technician can hear. It works with any type of gas whether its refrigerant, compressed air, nitrogen, or even a vacuum, all without changing a tip or sensor.