Headphone Guitar AMP Plug Amplifier Mini Amp USB Charge -Big Muff FREE SHIPPING Nice and mini appearance, easy to carry. Up to 15 hours of battery life with supplied rechargeable Lithium batteries. To Charge just connect the USB charging cable (provided) to your laptop or other standard USB port. Lithium battery come with LED power indicator that tells you when to recharge. AUX in lets you play along with your CD/MP3 player. It can control the volume & the tone. Fits for most electronic guitar, easy to operate. Excellent tone quality, lets you rock with your friends. Plug and play. nterfaces: AUX in, Earphone input, USB port, Item size: 8.8 * 7.8 * 2.6cm, Item weight: 53g, Package size: 18 * 13 * 3.5cm, Package weight: 119g, Effect: BIG MUFF