Casio Dg-20 Guitar Synth Midi Controller Dg20

It has adjustable tempo, transpose and tuning with separate guitar and rhythm volume controls ., It also has a built in speaker plus a headphone socket and an audio output jack for connecting to an amp or external speaker., It powers off an AC adapter or batteries, It's very easy to use, a manual is hardly needed but a copy of the manual is included anyway in pdf format, The DG-20 can function as a MIDI controller which will allow you to control other MIDI modules