Step 1. Don’t bother.  As there are “user serviceable parts inside.”
Step 2. Well if you insist on opening this piece of crud, the actual steps follow.

Step 1

- using a blunt, thin object (say a small screwdriver), slide it along the gap between the “body” and the “case”.
- work the screwdriver around the edge.

Step 2

- slide the body away from the case

(more…)