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If you're a headset devotee, you'll know that they don't always stay put on your ear. The Plantronics Voyager Pro UC packs capacitive sensors so it knows when you're wearing it—and when to direct calls to itself.

Think of the Voyager Pro UC, which will get its full announcement at CES in January, as asmart Bluetooth headset. Thanks to capacitive sensors, it knows when you're wearing it—if it happens to be buried in your bag across the room, calls will just go to your handset as usual. If you pop it on your ear mid-call, it'll reroute the audio there immediately. An included USB dongle lets you use it with a PC, and the sensors will automatically switch, say, your Skype status to "In a Call" when you're actually in a call.

And for those looking to get even more intimate with their earpiece, the Voyager Pro's "Whisper Alerts" will quietly intone the subject lines of emails from a set group of Outlook VIPs in your ear without anyone being the wiser. Clever! Pricing and availability will be announced early next year. [Plantronics]