Volkano Alive Series Heart Rate Monitor fitness band - Black

A state of the art fit bit with intelligent sensors.
The KX022 Sensor is a robust, low-power, I2C/SPI, 3-axis accelerometer with integrated FIFO/FILO buffer that features a wide range of embedded functionality, including tap detection, orientation, activity, and wake-up algorithms.
The Si1141 Sensor is a low-power, reflectance-based, infrared proximity and ambient light sensor to help track your sleep.