Start by opening the battery compartment and removing the batteries, using your fingers or something else to gently pull them out.

Peel off the three stickers that are hiding screws using your fingernails or something pointy, such as a pair of tweezers.

The stickers cover three of the screws. They are not shown in this image.

Unscrew the three T5 Torx screws behind the stickers using a small Torx screwdriver.

Remove the fourth screw located inside the hole near the top of the battery compartment using the same Torx screwdriver.