The 4x Relay Phidget is a mechanical relay board designed for a wide range of switching applications. It includes four SPDT mechanical relays capable of switching AC or DC loads, giving you control over high-power devices such as incandescent bulbs, fans, pumps, and other more. It requires external power and includes a barrel jack connector that accepts from 8-30VDC. This product features electrical isolation. This means the VINT port is isolated from the load, which can improve system stability. The 4x Relay Phidget connects to your computer through a VINT Hub Phidget.