Converts rear turn signals to runbraketurn. Works with LEDs or incandescent bulbs. Choice of 10 user selectable built in breake light strobe/ flash patterns (user can also select no stobe/ flash on brake. Ability to apply brake strobe/ flash patterns on brake lights only, turn nsignals only or both. When fits Smart function is Turned On, Strobe/ Flashing will be paused on turn signal when Simultaneously braking and turning. 10 user selectable running light intensities allow user to match the running light brightness of turns to center taillight. Built in short circuit protection. Sealed weathertight fits Case 4.2in. H x 1.4in. W x 0.6in. D.