Speaker size:50mm Impedance:32015% Sensitivity:110$3db Frequency range:20Hz-20KHz Microphone:6.0x2.7mm Microphone sensitivity:-42÷3dB Microphone impedance:2.2K O Directionality:omni-directional Cable length:2.2M$0.15 LED working voltage:DC5V5% Working current:≤100mA Headset jack:USB