Feature: 1. This dual color LED indicator light is uniform and has a life span of more than 10,000 hours. 2. The flat head LED indicator has high accurate CNC machine cutting technology, and the metal shell has high structural strength, which is more environmentally friendly and resistant to falling and collision. 3. This metal pre-wired LED has a built‑in waterproof sealing loop, which is waterproof and dustproof. 4. The signal LED has flame‑retardant base, high temperature resistance, flame‑retardant in emergency situations, fire‑retardant wire, enhanced conductivity. 5. Common cathod electrode means 2 color indicator lights share a negative electrode. Specification: Item Type: LED Indicator LightMaterial: Brass chrome plated Uses: Car modification, computer modification, access control switches, CNC machine tools, industrial control instruments Installation Size: M8 x 0.75mm Voltage: 110-220V Function: Common cathode (common negative electrode) Light Source Type: LED Working Temperature: -40℃~70℃/-40℉~158℉ Working Humidity: 10%-90% Shade Type: Flat head Protection Level: IP67, IK10Features: Common Cathod Electrode Means: 2 color indicator lights share a negative electrode After selecting the common cathod electrode, the black line is the common negative electrode, the red line is the red light (positive), the green line is the green light (positive), red and yellow, red and blue are the same. Size: Approx. 8mm / 0.3in. Package List: 4 x LED Indicator4 x Compression Nut4 x Washer