Donner Plexi Tone Mini Guitar Headphone Amp Amplifier with Rechargeable Battery 1.Connections: Headphone Out, AUX In.Aux in jack lets you play along with your CD/MP3 player 2.Up to 15 hours battery life with supplied lithium battery 3.Ture ananlog circuit faithfully simulates the response of the original amps 4.Plexi Sound give you the great high-gain sound of a mini amp 5.Power Supply: Lithium battery with LED power indicator.Plug&play