This document provides an overview of Sigfox and its low-power wide-area network technology for connecting IoT devices. Sigfox uses an ultra-narrowband radio technology that allows low-cost, low-power devices to transmit small amounts of data over long ranges. Key aspects include its public network architecture, security features to authenticate devices and messages, and the ability for devices to connect directly to Sigfox's cloud platform without any pairing or additional infrastructure. The document outlines how to build Sigfox-compatible devices, connect them to the global Sigfox network, and manage devices and data through Sigfox's cloud services.