The PLC2/PLC2.5 Series of 2" and 2.5" round marker/flasher combo LED modules can replace existing markers with no additional wiring necessary. Simply pop the old ones out and the new ones in and enjoy the safety of high-intensity flashing markers when activated. These modules can be set to come on as markers when powered (either color if a combination), or not if so desired. Controlled with the PLC light bar control or PLC-TX. Choose size and lens/LED colors below. Lifetime warranty.