The Electron is a tiny development kit for creating cellular-connected electronics projects and products. It comes with a Particle SIM card with service in more than 100 countries worldwide, and includes 3 months of Particle's 1MB monthly data plan for IoT devices.
The Electron kit also includes Particle's development tools and access to a cloud platform for managing and updating your new connected hardware.
Please note that the Electron is a GSM-only device, and does not support CDMA networks. 2G Electrons will not work in Japan, where 2G networks have been discontinued. Some US carriers are also planning to sunset their 2G networks beginning in 2017