About this Joyo AC20 20W Acoustic Guitar Amplifier The Joyo AC-20 is an amplifier designed with an amplification characteristic curve circuit specifically for acoustic guitars. It gives you a nice and bright treble with rich mid-low frequencies. Its 20W of power (10W + 10W Stereo Power Amp) 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. Connect your MP3 player or CD and jam along to your music using the easy Aux input. Joyo have done it again with a truly simple and remarkably practical acoustic guitar amp. The Power supply is included with this amp. The Tech Features Brand: Model: Guitar Channel Controls and effects Treble, Middle, Bass adjustment Three built-in digital effects of Chorus, Delay (Max delay time up to 500ms) and Reverb Volume Control Microphone Channel Controls and effects Tone adjustment Reverb effect Microphone Volume Control Two 5-inch speakers Guitar input: -18.2dBv Microphone input: -40.7 dBv (this only suits Dynamic Mics) Aux in: -14dBv Output: 20W RMS @ 4ohm/1khz Dimensions: 325mm x 190mm x 230mm Weight: Included Power Supply: ( Input: AC 100V-250V, 50-60Hz Output: DC 14V 4A)