1. This LED indicator light is uniform and has a lifespan of over 10,000 hours. 2. Precise CNC machining technology, the one-piece metal shell has high structural strength and is more environmentally friendly, resistant to drops and collisions. 3. These LED signal lights have a built-in waterproof sealing loop, making them waterproof and dustproof. 4. Flame-retardant base, high temperature resistance, flame retardant in emergencies, flame-retardant cable, improved conductivity. 5. Common anode (anode black line) means: 2 color indicators share one positive. Item Type: Indicator LED Lamp Material: Chrome-plated brass Applications: Computer modification, access control switches, CNC machine tools, industrial control instruments Installation Size: M12 x 0.75 Applicable Voltage: 110-220V Function: Common Anode Light Source: LED Working Temperature: -40℃~70℃/-40℉~158℉ Working Humidity: 10%-90% Display Type: Flat head Protection Class: IP67, IK10 Features: Common anode means: 2 color indicators share a positive electrode. After selecting the common anode, the black line is the anode of the common anode, the red line is the red light (negative), and the green line is the green light (negative). Red, yellow, and red and blue are the same. Size: Approx. 12mm / 0.5in 4 x LED Indicators 4 x Compression Nuts 4 x Washers