Connected with bracelets/smart bracelets are called smart band. In most cases, they have a normal form and their main function is to track and analyze your movements during the day. For that, most of the smart band have a pedometer, and sometimes also have an optical heart-rate sensor and several other sensors.
Continuously a wearable tracker senses the movements of the body on a 3 axis accelerometer. Every single data is recorded every time it is powered and up worn, which opens the tracker to trace if the individual is walking forward, running fast, or even standing still, etc.
