Amazon.com: HEXBUG Nano Land, Sensory Toys for Kids & Cats with Over 40 Pieces & 3 Nano Bugs, STEM Kits & Mini Robot Toy for Kids Ages 3 & Up, Batteries Included :
HEXBUG Flash Nano Nano Zone - Colorful Sensory Playset for Kids - Build Your Own Zone - Over 60 Pieces and Batteries Included - Walmart.com
HexBug Nano V2 - How to change the battery + How to make certain the battery is the correct way - YouTube