Andoer Vitoos Electric Guitar Plug Mini Headphone Amp Amplifier Heavy Rock Compact Portable Compact and light-weight design;Built-in distortion effect. Designed with 3 adjuster: Drive, tone, vol. 6.35mm/0.25in plug, just plug into guitar jack, no need of installation. Aux in jack lets you play along with cellphone or MP3 player. Comes with a splitter plug allow you to connect two headphones simultaneously. Powered by built-in rechargeable lithium battery.