Apple has signed a paten for interchangeable AirPods.
The company's plans - which were filed last year - to update the wireless earphones so that sound is directed depending on which ear they are placed in have been revealed.
By using built-in biometric sensors, the device will be able to determine which ear the Pods are inserted into to make them more comfortable to wear.
According to 9to5Mac, a symmetric earbud design "can be worn interchangeably in either a left or a right ear of a user."
The patent adds that "in such an embodiment, the earbud can include a sensor and circuitry configured to determine and alter operation of the earbud in accordance to which ear the earbud is determined to be sitting in."
Using biometric data it will be "configured to be pressed up against a portion of the tragus", which would enable the buds to take heart rate and body temperature measurements.
It was previously reported that Apple is working on the next two models which are slated for release in 2018 and 2019 and describes that the upcoming AirPods model will allow users to communicate with Siri.
The model, which is coming as early as this year, will allow people to summon Siri without having to physically tap the headphones by saying 'hey Siri'.
This function will work similarly to how a user activates the digital assistant on an iPhone or a HomePod speaker.
Known internally as B288, the headphones will include an upgraded Apple-designed wireless chip for managing Bluetooth.
For the model the year after, Bloomberg claimed the big feature will be the water resistance so that AirPods can survive splashes of water and rain.