Description:Power up your breadboard.
Specifications:This is a really inexpensive, assembled breadboard power supply. With an on-board USB port. Use it to power a USB device at the same time as you're working on your prototype.
Jumpers select 3v, or 5v, or off on each rail.
Make sure that when you place this on your breadboard, you orient it so that the (+) and (-) line up with the markings on the board.