Speaker dimension Ф 40 mm Impedance 32 Ω ± 15 % Speaker sensitivity 108 ± 3 dB Frequency range 20 Hz - 20 kHz Microphone sensitivity -38 ± 3 dB Microphone impendance 2.2KOhm Cable Length 2,1 m ± 15 % Audio plug 4pin 3.5mm jack