jamvox amp is in excellent condition and perfect working order. it is powered by usb connection and the jamvox software. the software has multitudes of different amp models, cab styles and the most popular stompboxes. It also has quite a variety of drum loops to practice along with and you can upload any mp3 and isolate the guitar parts from the rest of the music as well with the ability to slow the track down. it has headphone jack, external speaker jacks, and mic input also. you can also use these for bass guitar and vocals. these amps are great for college students or just practicing in the bedroom. also comes with the usb power supply.