The Fishman GII is designed for acoustic guitar, violin, viola, cello, and mandolin. It is made to maximize the frequency response potential of any piezo-style pickup. On the inside, all new electronics deliver cleaner, more transparent sound and an unprecedented 400 hours of battery life. Controls include voume, 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.