The Roland CUBE Street EX is a battery powered stereo amplifier for acoustic musicians and buskers, that also includes a power supply for gigs indoors too. Derivative of the original Roland CUBE Street amp, the CUBE Street EX is a serious upgrade. It boasts 50 watts of power via a dual two-way speaker design. It also has 4 discrete input channels catering for a combination of microphones and instruments. FX wise, the CUBE Street EX has an on-board COSM amp for guitar tones, EQ and reverb. There are also selectable power modes for power conservation.