Mobile phone handsfree H5 Earphone driver unit: 15mm Cobalt Impedance: 32 Ohm +- 15% Sensitivity: 125 dB at 1 KHz Microphone: 6mm electret condenser Directivity: omnidirectional Sensitivity: -58 dB +/ - 2 dB Impedance: U=4.5V, R=2.2 Ohm Frequency response: 30-16000 Hz Minimum Quantity : 1000 Pieces Product Lead Time : 25 Days