Trailer Tester Compatible Trailer Type Semi-Trailers Material Steel Connector Type 7-Way Round Control Type Manual Remote Operating Voltage 12V DC Features State-of-the-Art remote-controlled diagnostic trailer tester. Power lights Manually/All-On/Auto Scan or by remote control. Audible and visual alerts cross/open/overloaded/short circuit indication. Test ABS fault blink codes via auxiliary and brake circuit activation. Performs leak down test on service and emergency lines.