Mini amp plugs directly into your guitar or bass for instant pro sounding audio?anytime, anywhere * Perfect practice tool-listen though our headphone, crank it up without disturbing anyone around you! No need for bulky amp * Built-in amp simulation-tailor your tone, from ultra clean to heavy distortion * Up to 15 hours play time with convenient built-in Li-ion rechargeable battery, simply connect the USB cable to your computer for recharging