BENAVENTE GUITARS 3 BAND EQ ONBOARD BASS PREAMP. Auction is for one pre-wired 3 band preamp wired: treble and mids are boost/cut and bass is boost only. Can be ran 9 or 18 volt. Volume and blend pots included for an additional $50.00. Active/Passive Push/Pull switch or mini switch add $15. NOTE: I need to state the following: Read the description to understand what you're bidding on in this auction. The picture is just a picture of a Benavente preamp ready for shipping. The picture is showing a preamp with the vol and blend pot upgrade and just because you cannot see the battery clips on the back side, trust me, they are there. A jack also comes with the vol/blend upgrade upon request. I hope this helps clarify. You can also request 2 band if you like. Thank you...