ICIDU Neckband Headset With Microphone & Volume Control. Device connectivity: Wired, Device interface: 2x 3.5 mm, Cable length: 1.8 m. Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone frequency: 20 - 20000 Hz, Microphone sensitivity: 92 dB, Microphone input impedance: 32 Ом. Packaging height: 240 mm, Packaging length: 72 mm, Packaging width: 185 mm