时间：
2018
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07
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06
1. Speaker Specifications: outer diameter 40mm/32Ω20mW2. Rated Power of Headphone: 20mW*2 (series resistance, if not series resistance, it can reach up to 30mW*2)3. Degree of Separation: ≥40dB4. Working Hours for Outside Sound: ≥6 H Under 50% of volume5. Distortion: ≤1%6. Working Hours of Headphone: no limits7. Polymer Lithium-ion Battery: 3.7V/350mAh, decrease to 85% of capacity after 300 time charging and discharging 8. Charging Voltage: USB port DC-5V, I≥500mA9. Charging hours: ≤2.5H10. ...