Trailer Tester Compatible Trailer Type Boat Trailers RV Trailers Semi-Trailers Small Trailers Utility Trailers Material Steel Connector Type 4-Way Round 5-Way Round 6-Way Round 7-Way Round 7-Way Blade Control Type Manual Remote Operating Voltage 12/24V DC Features Audible and Visual Alerts Electrical Diagnostics Cross Circuit Fault Detection Light Testing Open Circuit Fault Detection Overload Circuit Fault Detection Short Circuit Fault Detection Wiring Diagnostics