1. Headphone jack: 3.5mm+USB
2. Speaker size: 40mm
3. Speaker impedance: 20 ohm +/-15%
4. Speaker rated power: 10mW
5. Speaker frequency range: 20-20KHz
6. Microphone sensitivity: -38db+/-3
7. Microphone leakage current: less than or equal to 0.3mA
8. Pointing: omni-directional microphone
9. Microphone impedance: 2.2K ohm
10. Microphone frequency range: 50-10KHz
11. Microphone head size: 4x1.5mm
12. Dimensions: 200x100x195mm
13. Headphone weight: about 259 g