Closeup view of some of the components on the Battery side of the Main PCB

AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual Mode

927 MPS1 MEMS Microphone. The Headphone uses three of these MEMS microphones

Could not cross the part number. If you know the part, please leave a comment below. The 2D bar code on the part reads as STM927352NH2S011

Unknown component. Labelled B2A. Please leave a comment if you happen to know this componentNew line.