SET OF 4 AutoSmart KL-25108RK 4" ROUND LED STOP TURN TAIL RED LEN LIGHTS INCLUDES LIGHTS, GROMMET, PLUG FOR TRUCK TRAILER Functions as stop, turn and tail light. Acrylic lens is sonic welded to the housing. 12-diode square RED LED light Operates from 9-16 volts 4 LIGHTS IN ONE BOX