Monaural headset for deskphones Noise-cancelling microphone filters background noise Break-proof, 360° rotating microphone boom (FreeSpin) Frequency range: wideband audio Weight: approx. 49 g Ear cushions: foam sponge, size L A connection cable oramplifier is needed to connect the headset (both options sold separately). Please note that the suitable connection cable depends on your phone. We are happy to help you find the correct cable. No additional cable is required when you choose to connect your headset via an amplifier.