This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Voyager 4210 211317-101, Wireless, Connectivity Interfaces USB, Bluetooth 4.1, Sound Output Mode Mono, Frequency Response 20 - 20000 hertz, Sensitivity 94 decibel, Impedance 32 ohm, Controls Next/previous track, Play/pause, Answer/end, Volume, Mute.
Poly (Plantronics) Voyager 4210 UC is a professional Bluetooth headset with wideband monaural audio. Voyager 4210 provides incredible audio quality with a full 20Hz to 20kHz frequency response range from the speaker.