1. This compact travel speaker system is ideal for use at the office, home or anywhere you go. 2. POWER SUPPLY:BATTERY(AAA 1.5V*4),DC 5V(USB CABLE FOR PC),OR AC POWER ADAPTOR CORD(OUTPUT 6V,300-800mA) 3. Out put power: 2Wx2 4. Frequency responce: 100Hz-20KHz 5. Speaker: 2"/ 4Ω, 3W 6. Gross Weight: 252g 7. with clock function