As we mentioned, the mVox Duo Communicator doesn't have a lot going for it in the design department. Measuring 3 inches long by 1.2 inches wide by 1 inch deep, the Duo Communicator is quite possibly one of the largest Bluetooth headsets we've ever seen. It has a mostly silver-and-gray design, which is fine, but the model we received had silver paint chipping away everywhere, making it look a little cheap.
On the front of the headset is a blue LED that flashes when the device is turned on. On the right spine are the power/mute button, the Headset Talk button, and a charger jack, while the volume rocker is on the left. On the back are the earpiece and a speakerphone button, which also houses a red LED that flashes when the speakerphone function is activated. There's also a rubbery flexible ear loop that can be adjusted to fit either ear. All the buttons felt a little spongy, but they were still very tactile and can be pressed easily. While the headset fit just fine around the ear, its large size and weight feels really awkward when worn on the side of one's face, as if it were weighing down our ear.
If you wish to use the mVox Duo as a speakerphone, all you need to do is insert the headset into the included black holster. The holster has a large clip on its back, which you can then clip to your shirt, to, say, replace a handsfree car kit. Once inserted, the speakerphone is immediately activated. In order to return to headset mode, just remove it from the holster--it's just that easy. In headset mode, you would use the Headset Talk button to make, receive, and answer calls; while in speakerphone mode, you would use the speakerphone button instead.
A key portion to this whole mVox Duo package is the included mVox Wizard software, which works only on Windows PCs. The software is used to set up a list of contacts with as many as three different phone numbers for each person, then you must go through a wizard that sets up the mVox Duo for voice recognition. (You will be prompted to attach your headset to the PC via a USB cable.) There's even a smart conflict-detection feature that warns against possible pronunciation mistakes, such as if you have the names "Brian" and "Ryan" in your contacts list, and asks you to repeat each name a couple of times so that it will know which name you're saying. The entire voice-calibration process takes a good 20 to 30 minutes, depending on how many names you want to add to your contacts list, and there's a slight learning curve involved in pronouncing certain words properly.