Trailer Tester, Compatible Trailer Type Semi-Trailers, Material Steel, Connector Type 7-Way Round, Control Type Manual, Remote, Operating Voltage 12/24V DC, Features Portable unit for commercial trailer lighting and ABS. Pulsar(R) mode/cross/open/overloaded/shorted circuit indication. Amperage readout; audible and visible alerts. Access ABS blink codes. Activates lights by remote control.