The High Pressure Gas Gun operates in implosion mode only, up to 15000 psi. The microphone is extremely rugged however it is not noise-cancelling and is less sensitive than the microphones on the Compact Gas Gun, Remote Fire Gas Gun or the 5000 psi Gas Gun.
In implosion mode, the volume chamber in the gas gun is bled to a pressure less than the well pressure, after which a poppet valve is rapidly opened to release gas from the well into the gas gun volume chamber in order to generate the pressure pulse.
Hamdon Energy Solutions carries most units in stock and can usually ship within 2-4 days.