There are 6 screws under the rubber feet on the bottom. Removing them allows the bottom plate to be removed, and then from there, the front panel, front cover, and battery compartment.

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Photos of the Main PCB. IC part numbers can be read off the photos.

DC to DC power supply and Yamaha audio amp chip/output filter inductors are the main parts of this side

More images of the main board assembly.

The pinouts of the main flex are actually stated on the board which is a huge plus.

A CSR Bluetooth SoC and MXIC flash are provided.

The battery pack is on a connector and can be removed before all of this is taken out.

Battery is a 2 cell 18650 pack with protection built in; 7.4V

Two 7W speakers with strong magnets are included in this speaker; it is marketed with a 20W power output. Excursion is about 7-10mm at its peak.

Two passive radiators are present inside the device. They're fairly heavy but rubberized, and they resonate and are tuned for low frequency reproduction. These move a LOT when it's playing. 7-10mm per side.