8 Channel 5V Relay Board

This is 8 Channel 5V Solid State Relay Module. A solid state relay (SSR) is just what it sounds like an IC that acts like a mechanical relay. They allow you to control high-voltage AC loads from lower voltage DC control circuitry. They accomplish this by using infrared light as the ?contact,? a solid-state relay is really just an IR LED and a photo triac sealed up into a little box.