The document discusses the Xiaomi miBand line of smartbands, including key details about the miBand 1, miBand 1a, miBand 1s, and miBand 2 models. It outlines the functionality of the bands such as smartphone unlocking, call/message alerts, fitness tracking of heart rate, steps, sleep, and calories. It also provides the technical specifications of each model since their release from 2014 to 2016. Lastly, it discusses how to develop third party apps that can integrate with and control the miBand functionality.