1. Horn diameter: 50mm
2. Impedance: 24ohm+/-15%
3. Sensitivity: 119db+/-3db
4. Frequency: 20-20000Hz
5. Microphone sensitivity: -40db-b+/-3db
6. Microphone impedance: 2.2kohm
7. Microphone size: 6x2.7mm
8. Wire length: 2.2+/-0.15m
9. Working current: about 140ma
10. Headphone jack: USB+3.5mm