This application is only for use with the ARSTN USB Pulse Oximeter or ARSTN Bluetooth Pulse Oximeter. For USB Pulse oximeter, it need the mobile phone with OTG function, and for Bluetooth Pulse Oximeter. You can connect it directly, and don’t need put PIN code. These Pulse oximeter combined with this application will allow you to non-invasively track and trend blood oxygen saturation (SpO2) , pulse rate (PR) and Perfusion Index (PI) for health, wellness, sports, Sleeping monitor and aviation use. More information please visit www.arystonetech.com