This is the VOX "FLAT4" booster/overdrive, featuring a vacuum tube. What do you think? Includes the main unit, instruction manual, and original box (as shown in the second photo). ⚫︎ Operation confirmed with both battery and AC adapter. ⚫︎ This is just my amateur opinion, but the vacuum tube provides a thick, warm sound. In addition, the effective tone controls allow for detailed sound shaping. ⚫︎ Knobs: Vol, Gain, High, Low, and Mid Boost on/off ⚫︎ The following is quoted from the manufacturer's website (excerpt): "Dedicated discrete circuit. Excellent response, perfectly conveying the guitarist's delicate picking nuances. True bypass. Employs "Hi-Volt" technology, allowing the 12AX7 vacuum tube to distort with a high voltage of 200V, even when battery-powered. A versatile vacuum tube booster that can be used for full-range boost, mid-boost, treble boost, and even overdrive. The independent mid-boost switch allows you to switch the characteristics of the mid-range, making it ideal for lead playing." Available for immediate purchase. Used item, sold as-is, no returns accepted. #EffectPedal #VacuumTube #Overdrive