2.0 Channel speaker system Output power: 8W RMS Input power : AC100V-245V , DC 9V 4*AA batteries 1. docking station 2.0 Channel speaker system2. Output power 8W RMS3. Input power : AC 100V-245V; DC9V 4*AA batteries4. Volume control and power switch with LED5. Frequency response 100-20,000 Hz Magnetically shielded Size: (W*H*D) 205 * 140 * 30 mm