This is a Bluetooth 4.0 Low Energy wearable sensor used for therapeutic purposes. It combines an ultra-low power Bluetooth radio with a precision accelerometer to measure angles on a human body. It is designed to be worn constantly and is only 3.5mm thick. The small coin cell battery lasts for more than 2 months while in constant operation. It uses a special antenna that is made for wearable applications in order to not de-tune too much when placed onto the body. There is a smartphone application that goes with it that displays the gathered data.