You are looking at the V0x amPlug 3 AC30 headphone amp. 

The well-known VOX AC30 sound. CH1 is the warm normal channel and CH2 is the sharp top boost channel. 

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)