Guitar headphone amplifier from amPlug 2 series that delivers three modes of the extreme high-gain sound of a US-made amplifier, and features a dramatically improved analogue circuit. It provides multi-effect functionality, foldable plug mechanism that rotates 180 degrees and an auto power-off function for improved convenience and ease of use. The pre-amplifier is powered by two AAA batteries (up to 11 hours of operation time, 17 with FX off), and provides a headphone output and an aux input. AAA alkaline batteries are included.