D&rsquo;Luca 4 Band EQ Pre-Amp Pickup with Volume Control for Acoustic Guitars Complete Kit Four-Band EQ, Volumen Control, Presence Control, Bass Control, Middle Control, Treble Control, Frequency Response: 20Hz - 20KHz, Power: 9V alkaline battery (included). Installation Instructions are NOT INCLUDED. The Complete Kit offers great tone and pickup range, and is made to be installed in the body of any standard acoustic Guitar D'Luca 4 Band powered pre-amp Pick-up unit