<b>Specifications</b><br> CD/MP3 input jack: 3.5mm<br> Headphone input jack : 3.5mm<br> Power Supply: Lithium battery with LED power indicator<br> Dimensions: 80mm (D)*30mm (W)*15mm (H)<br> Net weight: 50g<br><br> <b>Warm Tips</b><br> Cation: First, plug mini amp into the guitar connector. Next, connect the earphone and turn down the sound volume control to the lowest level. Then turn on the mini amp. The lights at the right-bottom of the front panel shows three different battery power levels; three lights 80%-100%, two light 50%-79% and one light 20%-49%(In need of recharging). On the right side is the USB charger indicator light which will only turn on when it’s in charging.<br><br> <b>Package included:</b><br> 1 x Donner Basement Headphone Guitar AMP<br> 1 x Splitter Headphone Audio Adapter<br> 1 x Stereo Male To Male Cable<br> 1 x USB Charge Cable<br>