Specifications Type: Neck-band Headset with Microphone Driver units 34mm Frequency Range: 20 Hz - 20 kHz Sensitivity: 105dB+/-3dB Impedance: 32 Ohm -/+ 15% Cable length: 220 cm Headphone Connector: 3.5mm Jack Stereo Microphone Connector: 3.5mm Jack Mono Blister Packaging Reference: CD-930