Developed and powered by A&D Medical, A&D Link can connect blood pressure monitor UA-851PBT-C with your iOS devices via Bluetooth wireless technology. App does not need to enter PIN to pair the A&D devices with your iOS devices. It is accomplished by Bluetooth SSP (secure simple pairing) protocol. At the end of each measurement, the result will be transmitted to the paired iOS device automatically. App user has an option to set the iOS clock to both A&D devices.