Nady AxeHead Miniature Headphone Guitar Amplifier &ndash; Built-in amp simulation with gain, tone and volume controls &ndash; includes headphones splitter, 3.5mm audio cable, and USB charging cable Mini amp plugs directly into your guitar or bass for instant pro sounding audio -- anytime, anywhere. Built-in amp simulation  tailor your tone, from ultra-clean to heavy distortion. With gain, tone and volume control Perfect practice tool  listen through our headphones, crank it up without disturbing anyone around you! No need for bulky amp. Includes an auxiliary input jack so you can play along with music, demos, or a click track coming directly from your phone or other smart device/mp3 player. All the necessary cables are also included Works great for bass guitar as well, Ultra-portable - Fits in your pocket! Up to 15 hours play time with convenient built-in Li-ion rechargeable battery  no need to change batteries. To recharge, connect supplied USB cable to computers USB port or optional AC adapter (note: only for recharging AxeHead, not for computer recording)