A solderless breadboard is the easiest way to quickly set up a prototype circuit for testing and modification. The components simply slide in and out of the spring loaded holes, so there are no issues when trying to get exactly the right resistor or capacitor in a tuned circuit for example.This unit includes three binding posts, so it can be used for circuits with a dual rail voltage supply, like a lot of op-amps require.Features:- 400 distribution holes- 1280 terminal holes- Mounted on a metal plate- 3 banana terminals- Rubber feet.