An ear-wearable electronic device includes a first near-field communication (NFC) device and a transfer region configured to facilitate transfer of a wearable sensor unit into an ear of a wearer or onto an outer ear of the wearer or a surface of the wearer's head adjacent the outer ear. The wearable sensor unit comprises electronic circuitry comprising a second NFC device configured to communicatively couple to the first NFC device and facilitate wireless transfer of power from the ear-wearable electronic device to the wearable sensor unit and wireless transfer of data at least from the wearable sensor unit to the ear-wearable electronic device, and one or more sensors configured to measure at least one physiologic parameter or physiologic condition of the wearer. The wearable sensor unit and the ear-wearable electronic device are configured to remain mechanically decoupled from one another subsequent to deployment of the wearable sensor unit.