| Dual light system functions as both triple-flash, alternating strobes and rear turn signals.
Strobing function meets SAE J845 Class 2 specification.
Turn signal function meets DOT rear turn specification.
Activating turn signal automatically overrides strobe function.
Two power wires allow strobes to be activated two ways, i.e. with cab switch and automatically when shifted into reverse.
4258-series lights are not interchangeable with quad-capable multi-function strobes (4343, 4333, and 8344 series round or 4353 oval).
"X" suffix denoted stripped wires for stobe function plus standard plug connector for turn signal.