The Hot Tubes Nano Overdrive Pedal from Electro-Harmonix is a log\r\noverdriver for the electric guitar player. It is a reissue of the original 1970s CMOS Hot Tubes, just in a compact pedal-board enclosure. The Volume and Overdrive let you go from a gentle rasp that caresses your notes to full-blown gain with powerhouse punch. The unit includes true-bypass\r\nswitching to keep your bypassed tone intact. A 9 VDC battery is included.