Handy 3 in 1 item! It is a USB charging hub, pen & phone holder, as well as an amplifier. Powered with a 47" USB mini cable (included). The caddy has 3 USB hubs for charging your phone or other mobile devices, or using for data transfer. The pencil cup keeps your phone handy while keeping pens, pencils and other utensils close at hand. Input: 5V; Output 500 mAh.