1. Headphone jack: 3.5mm+USB
2. Speaker size: 50mm
3. Speaker impedance: 16 ohm +/-15%
4. Speaker rated power: 10mW
5. Speaker frequency range: 20-20KHz
6. Microphone head size: 6x2.7mm
7. Microphone sensitivity: -38dB+/-3
8. Microphone leakage current: less than or equal to 0.3mA
9. Pointing: omni-directional microphone
10. Microphone impedance: 2.2K ohm
11. Microphone frequency range: 50-10KHz
12. Dimensions: 200x210x90mm
13. Headphone weight: about 330 g