Features: 1. Sense pressurized leaks, detects electrical arcing, and finds falling solenoids, valves and bearings . 2. Comes with a transmitter that emits an ultrasonic frequency to help locate leaaks that are not pressurized. Enough to emit frequencies the detector can pick up.(Only DY26) 3. Detects any pressurized leaking gas, including chlorofluoro carbon(CFCs), hydrofluoro carbon(HFCs), nitrogen(Ni), carbon dioxide(CO2) and steam., Manufacturer: GUYSGNX