Rgb pixels are digitally-controllable lights you can set to any color, or animate. Each rgb led and controller chip is molded into a 'dot' of silicone. The dots are waterproof and rugged. There are four flanges molded in so that you can 'push' them into a 12mm drill hole in any material up to 1.5mm/0.06" thick. They're typically used to make outdoor signs. Compared to our other 20mm led dots, these are diffused 8mm leds so they are not as bright but they color mix a little nicer. The pixels are connected by a 4-conductor cable. +5v, ground, data and clock. Data is shifted down from one pixel to the next so that you can easily cut the strand or attach more onto the end. Each dot is digitally controlled, with an internal 8-bit pwm led driver (24-bit color for 16 million different shades). The pixels must be clocked by a microcontroller The pixels use 8mm diffused rgb leds, with a 120 degree beam width. The total max brightness of all leds is about 1600mcd but with the light more evenly distributed & mixed than a clear led. (please note: mcd ratings of leds are notoriously inflated by most led sellers, so be extra-skeptical when reviewing led ratings!) Sold by the strand, each strand has 50 pixels in series! each strand has two jst sm 4-pin connectors so you can connect multiple strands in a row If you want to connect to the input of a strand (to wire it to power and a microcontroller) please get a receptacle connector. If you want to connect to the output get a plug cable. 50pcs/string, 250pcs/bag. 2000pcs/carton, gw; 16kg/carton, carton size: 46*26*46.5cm