Red 4" Round 7 LED Stop Turn Brake Truck Trailer RV White LED Reverse Light The LumenX L.E.D. 4 inch round tail light with a single cyclops back-up diode. Functions include stop, turn and tail light as well as a integrated back-up diode. 7 total diodes. Mounting grommet, 3-wire and 1-wire harnesses are all sold separately. Single bright white diode meets legal back-up light requirements when used in pairs. Regulated design provides voltage protection and conistent light output over entire voltage range New white diodes behind red lens for S/T/T functions. 4-1/4" height x 1-3/8" depth