Losing service to your phone and thus connection to your friends can be frustrating at the best of times. In an emergency, or traveling far from reliable cell service, being able to communicate can be a life-saving necessity. You can eliminate that disconnect danger with the new goTenna Mesh ($150 for 2), the first completely off-grid, mobile long-range mesh network.

Without the need of cell towers, routers, or satellites, goTenna Mesh will let you text or chat 1 on 1 or in a networked group or share GPS locations on previously downloaded offline maps over a several mile area. Paired with your smartphone via Bluetooth-LE, the device uses very little power, while its 1-watt UHF radio transmitter can broadcast up to3 miles (4.8 km) over open terrain and at least 1 mile (1.6 km) in more congested areas. Better yet, when traveling abroad you can keep in touch with your group without the need for roaming fees or international SIM cards. The only down-side is that those you are hooking up with also need to have the goTenna Mesh to connect. Details in the video.