These devices are commonly used to extend the output abilities of <a a="" brain")="" class="wiki" for="" href="/wiki/microcontroller.html" robot"="" title="A programmable digital controller (or ">microcontrollers</a> so they can link with more Servos. Using a Serial Data Stream with a simple 2 wire protocol - you can usally control 6 additional Servos.

The SSC is normally based upon a small, mass produced <a a="" brain")="" class="wiki" for="" href="/wiki/microcontroller.html" robot"="" title="A programmable digital controller (or ">MicroController</a> which simply takes those signals, and stores the instructions - maintaining the Servos at the desired position.

They normally have a very small footprint - mostly dictated by the connectors. Most good robot component stores have at least one range.