1. Speaker size: 40mm 2. Impedance: 32ohm+-15% 3. Sensitivity: 115+-3db 4. Frequency range: 20Hz-20KHz 5. Microphone size: 4.0x1.5mm 6. Microphone sensitivity: -38+-3dB 7. Microphone impedance: 2.2Kohm 8. Directionality: omnidirectional 9. Cable length: about 2m 10. LED working voltage: DC 5V 11. Working current: about 100mA 12. Headphone jack: 3.5mm a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a