MP3 seems to be missing as a format here, it is possible to play them.

The Fiio M7 runs Android. I have connected my Parrot Zik and Apple Airpods to it via Bluetooth without any problems.

High-resolution music player with FM radio and Bluetooth The FiiO M7 is just the right size, neither too big nor too small - it fits perfectly in the palm of your hand and the large display is easy to read. It supports high-resolution music files for top sound quality. In addition, an FM radio is integrated which provides a change to your own music with news, hit parade etc. Music can be listened to wirelessly via Bluetooth. aptX HD and aptX as well as the LDAC codec from Sony are supported. This way, you benefit from interference-free wireless sound in high-quality, true-to-detail quality. The player also scores in terms of usability: via the six clearly arranged DeepL access icons on the start screen, you can easily and quickly reach the desired function via the touchscreen operation. The FiiO M7 supports micro SD cards up to 512 GB, so thousands of music files in high-resolution quality are always with you.