This unit rated for up to 2.1 amps for Turns/Stops circuits and 7.5 amps for the Taillight circuit. Adapts import and domestic vehicles with separate turn and stop lights (3 wire system to standard trailer taillight wiring (2 wire system). Will work with either LED/Incandescent bulbs (vehicle & trailer). Designed not to send feedback thru the vehicle circuits. All solid-state components in potted encapsulaion. Will not work with vehicles with low-side switch. Includes intergrated protective cover.