This is a power module for the standard breadboard.
It's concave design so will not waste your proto zone. 
This breadboard power module support Mini USB power supply and power jack 7-12V supply.
There are two independent power that 5V/3.3V optional.
With this board, you can send power to both power lane of the breadboard, and each side has an on/off switch.

Features

3.3v / 5v power supply optional
On/Off switch for each bus strips of breadboard
Mini USB or External power supply oprional