Meet the StarVox: a smart walkie-talkie device that you can wear around your wrist to stay connected outdoors. It operates in 400-470 MHZ and has a working range of 2km. An unlimited number of people in your group can use it to chat.
The watch serves as a thermometer, barometer, pedometer, stopwatch, GPS, compass, and more. It is waterproof. Expected to ship in April.
[where to download it]