The unit has 3 main parts:

LED Matrix with the PCB.

Metal shell

Back plastic plug

Both parts are press fit into the metal shell. You will have to use tools to pry it open. Mind the O-rings designated in red

I found it easier to use the hook tool and insert it in between the usb-c port and rubber plug loop to get under the plastic.

Be mindful of the battery when using anything sharp. There is not much room between the battery and your prying tools