2 Lithium Polymer batteries required.

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Auto on & connect: the buds Air automatically turn on and connect to each other once taken out of their charging case so you can keep going hassle-free.
Class 1 Bluetooth Connection: a class 1 Bluetooth 5.0 connection keeps you going for 3-4 hours in each earbud plus 10 extra hours of charge in the case, that’s about 14 hours of your favorite music or podcast. *Since launch the buds Air have included Bluetooth 5. The package wasn’t updated in time for the launch so note that your package may say Bluetooth 4.2. Enjoy the upgraded Bluetooth 5.