Fishman G-II Acoustic Instrument Preamp Designed for acoustic guitar, violin, viola, cello, and mandolin Made to maximize the frequency response potential of any Piezo-style pickup All new electronics deliver cleaner, more transparent sound and an unprecedented 400 hours of battery life Controls include volume, bass and treble The preamps are housed in a rugged, lightweight injection-molded case. These units are fully portable and come complete with a heavy-duty stainless-steel belt clip It is Compact Volume, bass and treble sliders Easy-access battery compartment AC adapter jack Rugged injection-molded case