Dependance on a network of cell towers is acceptable when you’re in town, but stray a little (read: a lot) off the beaten path and you’re suddenly on your own. Beartooth aims to solve this problem by equipping your existing smartphone with a software-defined two-way radio that allows for communications with other Beartooth-linked smartphones without the need for any added infrastructure, relying instead on sub 1GHz license free bands. It also allows for individual and group messaging plus automatic or on-demand GPS location sharing to help locate friends on high quality topographic maps, working at ranges of over two miles depending on altitude. And if your smartphone’s drained, plug it into Beartooth’s USB port to charge it up using the latter’s 3,000mAh battery.

Hit up Beartooth for details – $250 for two