Brake Control For Use With Trailer Features Option to Allow Additional Braking Power When Towing Heavier Loads Led Indicator to Continuously Check The Electrical Circuit to Ensure It is In Sync and Active In-Dash Mounting for A Less-Intrusive Appearance Compatible with 1- 2- or 3-Axle Trailers Easy to Install Proportional Brake Controlling Reduces Strain on Vehicles Brakes Continual Diagnostics Check Includes Installation instruction