A statement from the company said the Enco Air would sell for $149, adding that it had powerful and dynamic audio enriched with vocal enhancement mode.
All three earphones have 5.2 Bluetooth connectivity which is claimed to be "lighting fast" and can be bought at the company's online store.
The Air is claimed to provide up to eight hours of playtime after a 10-minute charge. The Air also features adaptive AI noise cancellation.
It has been designed in collaboration with Danish hi-fi company Dynaudio. The active noise cancelling solution is based on real usage data and thousands of in-ear tests.
The OPPO Enco X earphones. Supplied
There are six high-sensitivity microphones, three on each earbud, which work in synergy to enhance voice while cancelling out background noise.
The Free2 earphones are claimed to have 30 hours total playtime when combined with the charging case.
The Enco X is the most expensive of the three earphones, retailing for $349.
It features a dynamic bass enhanced engine 3.0 acoustic system that adopts a coaxial dual-driver design usually found in high-end audio devices.
It is claimed to last for 25 hours on a single charge, with wireless charging also supported. The Enco X works with many Bluetooth devices.
"We are extraordinarily proud to be the third largest smartphone vendor in Australia and continuing the expansion of our ecosystem was the next logical step to best serve the one million Aussies using OPPO devices," said OPPO Australia's managing director Michael Tran.