Push-to-talk device lets smartphones operate off-grid

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Keeping touch with others while lost in the outback or hiking in the mountains can be difficult. Operating in areas with low signal or an overloaded network can reduce connectivity and make it hard to stay in contact. A new device called Beartooth is looking to solve this dilemma. The portable device works on a sub 1GHz bandwidth, and connects to users' smartphones via Bluetooth. It then acts as an antenna to establish a two-mile radius wifi network. Beartooth, which is small enough to fit in a pocket, wirelessly links users' phone to other phones in the area. This enables…

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