The Particle Boron is a LTE CAT-M1/NB1 enabled development board that allows you to connect your mesh network to over a cellular service. With the Nordic nRF52840 SoC and two SARA cellular modules you have all the power of an ARM Cortex M4 with OpenThread mesh networking, LTE cellular connectivity, NFC, plenty of GPIOs, LiPo charging and more. The board is designed to act as a standalone cellular endpoint or an LTE enabled gateway for a Particle Mesh network.
The Boron is also configured in the popular Feather footprint and so is compatible with Feather Shields! That means it includes a JST connector for a Li-po battery as well as charging of the battery over USB. Particle also provides an RGB status LED and a JTAG (SWD) connector for debugging and an onboard PCB antenna for your mesh network. You will need to connect a cellular antenna to the U.FL connector to use the cellular connectivity.
The Boron comes with access to the Device Cloud (10 free micro networks available) as well as three free months of device Cloud access using a cellular gateway. The Particle Could has some great features for building connected projects, including over-the-air firmware updates, and easy-to-use REST API, and firmware development supported by web and local IDEs.