These are 5mm superbright LEDs prewired with a resistor and 150-250mm of flying leads, ready to be used on any DC voltage from 9 to 14 volts.
They are ideal for automotive use, or for when you need a ready-to-go LED light without the hassle of wiring one up yourself.
Note: We currently have two brands of these, some with red and black leads (+ve and -ve respectively) and some with black and white leads (+ve and -ve respectively - yes, the black is positive on these).