Battery side close up view of the Main PCB

AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual Mode

913 MPS1 MEMS Microphone. The Headphone uses three MEMS microphones with this part number

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 STM9135G15JAS011

Crystal Oscillator

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

Unknown component. Labelled SV4CP 240. Please leave a comment if you happen to know this component. Separated from PCB during teardown