You need to connect ChoiceMMed's bluetooth products to iChoice APP, transmit and record your health data, also could review your historical trend, helps to better manage your life and work. iChoice APP is all in one APP, you could view and track your blood pressure, blood oxygen saturation, temperature, heart rate, etc. Better understand and manage your health！ Features: -Record and manage multiple health parameters, such as blood oxygen saturation , blood pressure, body temperature, etc. -C