1. USB wired power supply 2. 3.5mm audio cable connection 3. Rotary volume adjustment, easy to use 4. Charging voltage: 5V 5. Sound unit: 58mm 6. Frequency response range: 80Hz-18kHz 7. Signal to noise ratio: greater than or equal to 80dB 8. Adopting dual unit + dual bass diaphragm design, small size and sufficient volume 9. 6D cinema sound effect four units 10. Material: plastic + metal
