How secure is the Bluetooth connection?

AirMini Device/App Connectivity

ResMed secures the Bluetooth connection by requiring you to scan the QR code or enter the four-digit KEY code to pair. The KEY code ensures that only the primary user can pair a smartphone to the AirMini. This helps provide a private connection between the smartphone and the AirMini, securing the patient's sleep data. Additionally, we encrypt all data transmitted over Bluetooth and exclude any personally identifiable information.