Trailer Tester, Compatible Trailer Type Boat Trailers, RV Trailers, Small Trailers, Utility Trailers, Material Plastic, Connector Type 4-Way Round, 5-Way Round, 6-Way Round, 7-Way Blade, Control Type Manual, Operating Voltage 12V DC, Features Short Circuit Protection, Turn Signal Simulation and Power Verification LED, Water-, Electrical Diagnostics Light Testing, Short Circuit Fault Detection, Wiring Diagnostics, Brake Types Tested Electric Brakes