This true stereo, passive hydrophone is made with shielded black cable, a 27mm doubled brass piezo head coated in black non-toxic rubber, and a stereo 3.5mm (1/8 inch) male output plug on a 305cm cable.
This hydrophone can be used for all kinds of underwater listening and recording, including detecting swimming pool leaks. It can also be used outside of water as a normal contact microphone and is rugged enough to be safely frozen or boiled. Use with an amplifier for best results.
Frequency range: 80Hz to 2000Hz.