This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Voyager 4210 214601-08, Up to 12 hours talk time and 15 hours listen time, Up to 13 days standby time, Speaker 20 Hz - 20 kHz, Speaker impedance 32 ohm, 360mAh typical/350mAh minimum, Charge time 1.5 hours for full charge, Control Call answer/ignore/end, redial, mute, volume + /-.
Power up productivity for office workers with Voyager 4200 Office and UC Series Bluetooth® wireless headsets. Connecting is seamless—desk phone, smartphone or computer. Outstanding audio, freedom to roam.