Name:2010electric guitar amplifier Portable Electric Guitar Amplifier >power RMS 20watt >Inputs 1*Jack >Input,Selector (Clean /distortion selector),Gain >Low,High >1 Earphone output >1 Master Volume control Dimensions(mm):280*168*240 Guitar Amplifier RMS 20W Input impedance 220kΩ Input sensitivity 154mV(3K-4KHz) SNR 83dB Speaker size 6.5 inch Material MDF G.W(KG) : 5.1 Packing Carton Size(m): 0.33*0.232*0.325 20GP:1170PCS40GP:2425PCS 40"HQ 2843PCS Related Model Guitar Amplifier Output power 10W 15W 20W Input impedance 220kΩ Input sensitivity 78mV(1KHz)154mV(3K-4KHz) SNR 80dB 82dB 83dB Speaker size 4 inch 6.5 inch 6.5 inch Material Medium Density Fiber Board,PVC,PaintingFunction Input,Selector(Clean /distortionr),Gain Low,High 1 Earphone output 1 Master Volume control Size(mm) 190*120*230 300*150*320 280*168*240