ICIDU Neckband Headset Ultralight . Interface type: 3.5, Cable length: 1.8 m. Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 103 dB, Impedance: 32 Ом. Weight: 100 g. Compatibility: Multi, Frequency range: 20 Hz -20 KHz, Packaging height: 180 mm