Compatible with all audio players with 3.5mm stereo input cable4-watt total power output; 2 watts per channel Speaker are pre-amplified and magnetically shielded with two 1 1/2" full-range metal driversFrequency response:150Hz-18kHzUses USB cable 4 AAA batteries (included) or AC cable (not included) for power Includes 3.5mm stereo input cable and carrying bag