Tiny but tough, this active condenser hydrophone is great for all kinds of underwater listening and recording. Made with shielded, waterproof cable and a high quality metal output plug. The microphone element is shielded and encased in clear, marine-grade silicone. This hydrophone is low noise and high sensitivity with a frequency response range of approx. 20 - 20 000 Hz, and impedance of approx. 600 Ohms. Requires 1.5 - 9 volt plug in power. If unspecified, standard model comes with a mono 1/8" male output.