Over 10,000 hours lifespan with uniform light emission for practicality. Environmentally friendly and drop-resistant with high-precision CNC cutting and unibody metal shell. Common cathode electrode means 2-color indicator lights share one negative electrode. Features fire-resistant wire for improved conductivity and a high-temperature resistant flame-retardant base. Waterproof LED lights include a built-in waterproof sealing ring for dust and water protection. ----------------------- Item Type: Pre-wired Round LED Lights Material: Chrome-plated Brass Applications: Car modification, computer modification, access control switches, CNC machine tools, industrial control instruments Installation Size: M12 x 0.75 Voltage: 3-6V Feature: Common Cathode Electrode Light Source Type: LED Working Temperature: -40℃~70℃/-40℉~158℉ Working Humidity: 10%-90% Display Type: Flat head Protection Level: IP67, IK10 Size: Approx. 12mm / 0.5in Features: Common Cathode Electrode Meaning: 2-color indicator lights share a negative electrode. When using the common cathode electrode, the black wire is the common negative electrode, the red wire is the red light (positive), and the green wire is the green light (positive). This applies to red and yellow, and red and blue as well. ----------------------- Package includes: 4 x LED indicators, 4 x compression nuts, 4 x washers