NUX AC-25 is a compact acoustic amplifier with built-in rechargeable battery that can run up to 4 hrs for busking. It is equipped with 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 music via Bluetooth Audio Stream, or auxiliary input.