The NUX AC-25 is a compact acoustic amplifier with built-in rechargeable battery that can run 4 hrs for busking. It equips a 6.5" speaker, Modeling Preamps, Reverb, Bluetooth Audio Stream, Drum Machine. You can tweak it through Stageman APP on the mobile phone. The dual channel configuration means you can plug a dynamic mic and your acoustic guitar. You can play playbacks via Bluetooth Audio Stream, or auxiliary input. Let's busk on the streets!