When you need to send a message from your smartphone and find yourself without a reliable Wi-Fi or mobile signal, you have two options: You can either use another mobile network’s laughably expensive and spotty service, or send a carrier pigeon.

And since neither of those options are ideal, the pioneering minds over at goTenna created the the Mesh—a remarkably simple and innovative way to send messages and GPS locations from your phone, even if you don’t have any mobile service, and right now the goTenna Mesh is on sale for over 10 percent off at just $155.

The Mesh utilizes revolutionary networking technology that relays messages and data through other nearby devices—even if there’s no established mobile or Wi-Fi network to be found.

It transmits on UHF frequencies that give you 40% more range than a standard walkie-talkie, up to 4.0 mi (6.4 km) in open areas and up to 0.5 mi (0.8 km) in dense locations. And, if that's not enough distance for you, you can also strategically place goTenna devices in your area to extend your own coverage further.

You’ll be able to send secure messages via your own private network, communicate with others without service, link to other goTenna users to expand your network, and even track messages with delivery confirmations. The Mesh also lets you access and download free offline maps of areas around the world—making it perfect for frequent off-road travelers.

Plus, the Mesh is designed with no central storage and leverages end-to-end encryption to send your messages, meaning your conversations will remain private when you chat off of the grid.

The goTenna Mesh is on sale for just $155.

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