The wires connect to a ribbon cable connected to the top of the plastic top, which then runs through a slot to the board. This could likely be dismantled non-destructively if you know what's there (but not without destroying the plastic body to get here).

Back side contains AXS T1 868 A50P next to the ribbon cable connection. There is also BTR0018, presumably the bluetooth controller. Another smaller chip would require a magnifying glass to read. Others are just labeled Uxx, where xx is some number.

Front side main chip is CSF 8640 B04G 8334P5. The large copper foil attaches by the back side of the bluetooth chip, and is presumably the antenna.