The TC4056 is an omnidirectional hydrophone with a low noise +10dB or +20dB preamplifier build-in making it highly sensitive. TC4056-1,3 comes with a 10m high quality cable/TC4056-4 comes with a 5m high quality cable - all with 3 twisted shielded pairs AWG20. A version with Jupiter connector is available TC4056-3. Per default the amplifier is provided with differential output. The differential output is an advantage where long cables are used in an electrically noisy environment. For use in single ended mode: Use positive output pin together with GND.