This IoT development kit from Particle includes the Xenon development board, a mini breadboard, and a USB cable. The starter project includes two resistors of 220Ω, one red LED, and one photodiode.
The Xenon is also configured in the popular Feather footprint and so is compatible with Feather Shields! This 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.
The Xenon 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.