WIRELESS EARBUDS

We want to develop earbuds like Apple Airpods; which is blutooth, and truely wireless. The internals are based on a product already available on market. The main focus would be improving the aesthetic and ergonomics of the product, as well as the comfort, fit, and how secure the ear buds are when they sit in your ear, i would take care my self about this part and anything related to shape or mechanical design. The unique point would be that the earphones would be to; use the latest bluetooth 5.0 technology, IPX7 waterproof rating, long battery life a battery case with a built-in power bank and bluetooth speaker, supporting wireless charging single smart touch button to control phone functions utilizes dual driver technology for superior sound a large variety of earbud tip size, design and materials will be included as standard to achieve the best comfort and fit as well as the bottom part of the housing which sits on the ear would be interchangeable to allow for different ear sizes and shapes The main thing would be a good battery life with a long playtime per charge without sacrificing weight too much. Approximately 3 to 4 hours battery life should be fine but if we can make it longer maybe 5 to 6 we can claim to have the longest playtime on a single charge. The charging case will be able to keep it charged up a few times to full normally. A thought I had about another feature would be perhaps to make the charger pluggable when the ear buds are in use. Almost converting it into a sports style wireless earphone where there is a module that sits on the back of the neck connecting the 2 earbud sides. Another idea was that to increase the comfort and fit of the ear buds to make the bottom of the ear bud where it sits into the ear canal and outer ear interchangeable with different sized or shaped silicone seats. For the audio driver I would like a hifi larger driver for better sound reproduction or I was considering dual driver technology. If you research a brand called soundpeats from China they have a dual driver ear bud which we can apply to the design. I would be relying on your expertise to improve the design and features of this project. Please let me know what you think.