These are hard to find and great for your DIY projects, electronics, model trains, robotics, educational projects, etc. Or get them to resell to your customers. Works off 9vdc battery or other DC source as low as 6volts. Red LED lights when the switch is in "on" position. Great for astronomy use with your dark adapted eyes, or build into your equipment. LED is mounted on switch assembly with 20 Ohm resistor, and 4-1/2" long leads (center lead is positive). SPST low voltage on/off slide switch. Unused in original packaging. Price is for a package of 100.