I will be adding video and notes of frequently asked questions and repairs:
How to change the batteries-
You will need 2 x AAA batteries. Depending on the year of your gadget, you will either need a #1 or #2 phillips head driver. Here is a video of Kaylasia explaining the simple process.
My box rattles and doesn't work-
If your gadget has been dropped, or mishandled during shipping it's likely your batteries have been knocked out of the battery pack.