Plantronics Savi 740 Wireless Headset System for Unified Communication Lightest DECT wireless headset on the market. Digital encryption: 64-bit Choice of three comfortable, customizable wearing styles. Audio performance : PC plus desk phone Wideband: up to 6,800 Hz Hot swappable battery for unlimited talk time (Additional battery sold separately) Elegant magnetic headset docking 3-way connectivity lets you easily switch and mix audio between desk phone, PC and mobile phones Call answer/end, vol+/-, mute and flash Battery meter conveniently displays headset battery life remaining in PC icon tray Convertible (over-the-ear, behind-the-head, over-the-head), over-the-ear, and over-the-head (monaural and binaural) designs available Elegant magnetic headset docking Hot swappable battery for unlimited talk time (Additional battery sold separately)