Tiny Chug Jug

The thing measures 53x30x30mm, is powered by a single CR2032 battery, and has a cool colour changing effect (thanks to a couple of internal LED's)

Here is a video of it working: https://www.youtube.com/watch?v=g6WLSP6TuvU

Also here is a link to my store if you want to buy an already assembled unit: https://www.etsy.com/au/shop/ANTALIFE