The Joyo AC-20 is an amplifier designed with an amplification characteristic curve circuit specifically for acoustic guitars. The acoustic amplifier gives you a nice and bright treble with rich mid -low frequencies. Its 20W of power (10W + 10W) will meet your needs for practice sessions at home up to even small live shows. The guitar section of the AC-20 features 3 built-in DSP effects: Chorus, Delay and reverb, and all of which can be used simultaneously which is very rare among similar amplifiers. The other section on the AC-20 is the well designed dynamic.Microphone amplification channel giving you a clear and powerful vocal sound, this channel also features a reverb, which is the key making your vocals shine. Any great acoustic amp has an AUX input and so does the AC-20. Connect your external sound device to the aux in and you can jam along to your music. Joyo have delivered a truly simple and practical acoustic guitar amp, perfect. On the guitar control your EQ with Treble, Middle, Bass adjustment and dial in three independent built-in digital effects of Chorus, Delay (Max delay time up to 500ms) and Reverb Volume Control. On the Mic, its all about simple tone adjustment with reverb effect and microphone volume control. Note: the JOYO AC-20 can support only moving-coil Microphones. Speaker Two 5-inch speakers special for acoustic amps.