Here is a handy tool that helps you stay in contact with your crew outdoors. The AWIRE is a wearable 2-way radio that works with your smartphone to keep you connected. It lets you communicate with your crew from up to 2 miles away without having to search for a good signal. You will be able to take calls and listen to music.
The AWIRE is portable and lightweight. Its one-touch operation makes it easy to communicate with the rest of your group. The battery life lasts for up to 5 hours. You can find out more about this wearable device on Kickstarter.