Specification: - Product specifications: thickness: 10mm, (excluding 4 angle iron) outer diameter: 40.8mm (without black silicone ring) - Line position function: - Red line (Button +12V power supply line) - Black line (button LED light negative control) - Yellow line (key switch positive power trigger output control) - 3-line function description: - + Positive trigger output control, after pressing the start button, the yellow line outputs +12V; the black line connects the button light to control the negative output line, and the button light illuminates. Package Included: - 1 x Auto Car Engine Start Stop Push Button