You are looking at the Vox amPlug 3 Bass headphone amp. Standard bass amp sound. CH1 has a wide range, CH2 has a fat, punchy overdrive sound. Ideal for pop, Rock or Jazz. amPlug3 is the third generation of the amPlug series, the headphone amplifiers that can simply be plugged into a guitar and used right away. With a variety of amp options and guitar tones available, amPlug offers an ideal solution for guitarists and bass players to practice with the best tone while keeping things simple. INPUT/OUTPUT TERMINALS: Phones jack (3.5mm stereo mini phone jack) AUX jack (CTIA - compliant 3.5 mm TRRS mini phone jack) POWER SOURCE: 2 AAA dry cell batteries or 2 AAA nickel-hydrogen rechargeable batteries BATTERY LIFE: 10/16 hours (alkaline batteries, FX or RHYTHM on/off) 3/5 hours (manganese batteries, FX or RHYTHM on/off) DIMENSIONS (W X D X H): 87 x 33 x 39 mm (plug retracted) WEIGHT: 40 g (excluding batteries)