1. Headphone jack: 3.5+USB
2. Speaker size: 40mm
3. Impedance: 20 ohm +/-15%
4. Rated power: 10mW
5. Frequency range: 20-20KHz
6. Microphone head size: 6x2.7mm
7. Sensitivity: -38dB+/-3
8. Leakage current: less than or equal to 0.3mA
9. Pointing: omni-directional microphone
10. Impedance: 2.2K ohm
11. Frequency range: 50-10KHz
12. Dimensions: 205x210x100mm
13. Headphone weight: about 330 g