When looking at the front of the device, with the charging point at the bottom the device has a hinge clip and wires on the top right.

With a fingernail or some kind of slim pry tool, gently lift from the bottom left corner.

There is adhesive that is holding the faceplate on, If you have difficulty pulling it off, use a plastic spudger by inserting it in on the bottom left then slowly hinge the device open while applying pressure to the adhesive pad to loosen it.