1. Headphone jack: 3.5mm
2. Speaker impedance: 20 ohm +/-15%
3. Rated power: 10mW
4. Frequency range: 20-20KHz
5. Microphone head size: 6x2.7mm
6. Microphone sensitivity: -38db+/-3
7. Microphone leakage current: less than or equal to 0.3mA
8. Microphone direction: omnidirectional
9. Microphone impedance: 2.2K ohm
10. Microphone frequency range: 50-10KHz
11. Size: 225x110x230mm
12. Headphone weight: about 455 g