ER1945X Features Superb bass stereo sound Pocket sized design for portability Widely works with PCs， MP3 player and motorbicycle General Specs Brand & Model A210  Output Channel 2.1 Music Peak Power 90W Rated Power 60W Voltage 12V Frequency Response 10-240Hz Output Impendence 4 Ω Degree of Distortion 0.01% S/N Ratio 95 dBA