From Vocera :
A wearable device that weighs less than two ounces and can easily be clipped to a shirt pocket or worn on a lanyard. It enables instant two-way voice conversation without the need to remember a phone number or manipulate a handset.
The Vocera Communications Badge is controlled using natural spoken language. To initiate a conversation with Jim and Mary, for example, the user would simply say, “Get me Jim and Mary.” In addition, when a live conversation is not necessary, text messages and alerts can be sent to the LCD screen on the Communications Badge. Pricetag ~ $400