Key benefits - Simplified wiring with color coded lines: Red for the button power, Yellow for positive trigger output, Black for button LED negative control. - Compact panel fit: 10 mm thickness and 40.8 mm outer diameter, suitable for tight spaces (excluding 4 angle iron and without black silicone ring). - Clear LED indication and control: press start to trigger Yellow line output, while Black line drives the LED negative to illuminate the button indicator. Product specifications - Thickness: 10 mm (excluding 4 angle iron) - Outer diameter: 40.8 mm (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: