Size of speaker: 40 mm 32015% impedance Sensitivity: 3dB + 101 Range of frequencies: 20 Hz–20 kHz Mic: 6.0 x 5.0 mm Sensitivity of the microphone: -42+3dB Impedance of the microphone: ≤2.2K Q Directionality: all-encompassing 2.2-meter cable $0.05 Working voltage for LEDs: DC5V$5% Current of operation: ≤ 100mA Headphone connector: USB+3.5