The volume encoder and line-in jack can be removed separately. Unfortunately, the microUSB port and the power button are soldered to the mainboard. This leaves us with a happy and a sad eye.

These are the chips we find on the board:

Actions Technology ATS2819 Single-Chip Bluetooth Audio Solution

cFeon Q80B-104HIP

TP4056 Li-Ion Battery Charger IC

On this board you can see the antenna in the bottom left corner.