Instruction: 1. Support many kinds of audio players 2. Multi-color available, stylish design 3. Volum Control Specifications: OutPut: 1.5W * 2 Speaker Unit: 2.25" 4 Ohm Frequency Response: 180Hz-20kHz Power: USB power 5V Deimension: 6 1 mm* 7 4mm * 61 mm ( W* D * H)