The StarryTow 4'' sealed round stop,turn,tail light complies with the standards of DOT ,  It is easy to  install the light by using the included rubber grommet and three-prong plug;  Works with 12V system ;

For use on vehicles/trailers over and under 80 in. wide

DOT compliant

1 incandescent  Stop, turn,tail light 

Red lens

Rubber mounting grommet

Three-prong plug with three wires

The three-wire design includes the lead wires for power and a ground wire for mounting to any surface