Frequency Range (Overall): 7 Hz - 22,000 Hz * 
Hydrophone Transducer Type: MPC (Piezo) 
Configuration: OmniDirectional 
Hydrophone Packaging: Rugged epoxy case, approx. 60mm Dia x 8 mm Thick 
Cable Type: High Quality, Low Noise, Neoprene/PVC jacketed for long life 
Cable Length: standard: 8, 16, 24, 32 metres. optional: lengths to 100 metres.. 
Preamp: Supplied with Line/Earphone Output 
Audio Output: MONO. Adjustable Level ~ approx. 50 mW 
Output Connector: 3.5mm (1/8") stereo jack 
Earphones: Samarium Cobolt in-ear type ('walkman-style') 
Power: Approx 7 mA at 9V 
Battery: Standard 9V (PP3) transistor radio battery 

* Note: frequency response is given for entire system including earphones. This limits the frequency response to normal human ranges. When using the spectrogram software (included) for recording sounds directly from the DolphinEAR, the useful low frequency range extends down to a few Hz; the upper frequency range extends to more than 22 KHz. DolphinEAR is designed for casual recreational use, but is rugged enough for demanding commercial and industrial applications , or research projects.