This holds batteries. Holds'em very well!
With a versatile design like this, this battery holder has many different potential uses. It will hold a standard CR2032 (20mm) battery.
The biggest feature of this board is the On/Off physical toggle switch. Even your best and most innovative creations will need to be turned off to save precious battery life at some point in time! The switch is referred to as a "slide switch" which makes it particularly useful for not pressing by mistake.
Each board also has four connection points, two are positive and two are negative, for an easy way of incorporating this into your projects.