Sweex Speaker Control Neckband Headset. Device connectivity: Wired, Cable length: 2.3 m. Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом, Headphone sensitivity: 105 dB. Microphone frequency: 20 - 16000 Hz, Microphone sensitivity: 58 dB. Connector(s): 3.5mm