iPhone 15 Pro Max maybe too large to align with the charging area of the product. You can try to charge the iPhone 15 Pro Max horizontally.
If your iPhone cannot be charged, it may be caused by the IOS version (especially IOS 14.3). Please try to restart your phone to solve this problem.
The power of the earplugs charger is 5W, The time will be longer to fully charge a phone, it is recommended to charge of the phone at night using this part.
Charging Area: On The Front-7.5 W, On The Back-5 W, On The Top-3 W.