1. Speaker size: 40mm
2. Sensitivity: 100 +/- 3dB
3. Frequency range: 20Hz-20KHz
4. Microphone: 6.0x5.0mm
5. Microphone sensitivity: -42 +/- 3dB
6. Directionality: omnidirectional
7. Impedance: 20ohm+/- 15%
8. Microphone impedance: 2.2kohm
9. Headphone jack: USB+3.5mm
10. Cable length: about 2.2m
11. LED working voltage: DC 5V
12. Working current: about 200mA