Sonnet is a hardware device that wirelessly connects to smartphones and gives them the capability to transmit and receive long-range radio waves. This transforms your smartphones into walkie-talkies/two-way radios that can send text messages, images, voice recordings, as well as GPS coordinates with each other without cellular reception or Internet connection. The wireless communication protocol of Sonnet enables a point-to-point range of approximately 5km (3mi). It also supports mesh networking, which can dramatically increases the effective range by relaying data through intermediary Sonnet devices.