In addition to the PLC100 series, the PLC50 4.5" LED modules install with two wires and mount anywhere on the truck body with two screws. When connected to power, the marker light mode can be set to active or inactive. To activate the desired flash sequence, simply engage the button linked to control it. There are 8 flash patterns to choose from with a simple wave of a magnet. The PLC50 Series is the perfect compliment to your Power-Link lightbar but can also be purchased separately and used in conjunction with a PLC-TX. Chrome ring included. Lifetime warranty.