This is a conveniently packaged CR2032 battery with wire leads and connector already attached. These are lithium alkaline (non-rechargeable). They are usually used for remote controls, computer motherboards (CMOS) for PCs, laptops, notebooks, etc. They are also great for powering brush robot, bristle bots and toothbrush bots projects. Each battery is 3V and 210mAh.
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
This simple but amusing magnetic toy will keep you busy for hours!
Get one of the craziest and coolest kaleidoscopes around!
Is it a demonstration of a scientific law or a work of art?
Defy gravity with this cool balancing eagle!
Learn all about the science of light, optics and visual perception with this wonderful kit!