This is an early model Tri-logic made by Xotic. It runs on 18V, providing a wide range effect with plenty of headroom. The EQ frequency points seem to differ from the current EWS version, making it also recommended as a preamp for an EUB (Electric Upright Bass). There are minor scratches and scuffs from use. Operation has been confirmed. This is a sale of the main unit only, but a voltage doubler will be included as a bonus. No claims and no returns. Due to past transactions, I kindly request that only those who can promptly confirm receipt after delivery consider purchasing. Thank you.