It has a built-in MP3 and Line input for playing and listening to music at the same time, simulating Line output, and headphone output, respectively, for quiet practice or recording. The combo can also be powered by a battery. Dimensions: 175mm x 136mm x 107mm, Weight: 1kg The FLY 103 speaker is specially designed for use with the FLY 3 combo as an external speaker. It has a built-in cable to connect to the combo, making the FLY 3 6W stereo set-up. The box is also equipped with a 3 "Blackstar speaker offering revolutionary sound features.