4 Sets PreWired Round LEDs Waterproof 2Color Light Common Anode Anode Electrode 1224V 12mm(Red and Blue ) Item Type: Pre-Wired Round LEDsMaterial: Brass chrome plated Uses: Car modification, computer modification, access control switches, CNC machine tools, industrial control instruments Installation Size: M12 x 0.75 Voltage: 12-24V Function: Common Anode electrode Light Source Type: LED Working Temperature: -40℃~70℃/-40℉~158℉ Working Humidity: 10%-90% Shade Type: Flat head Protection Level: IP67, IK10Size: Approx. 12mm / 0.5inFeatures:  Common Anode Electrode Means: 2 color indicator lights share a common anode electrode After selecting the common anode electrode, the black line is the common anode electrode, the red line is the red light (negative), the green line is the green light (negative), red and yellow, red and blue are the same.