BTF-LIGHTING 100 pcs WS2812B Black LED chips With Black PCB Heatsink (10mm3mm) WS2811 IC Built-in 5050 SMD RGB DC5V The ultra bright ws2812b smart full-color LED pixel is individually addressable. It has 256 brightness display and full 24-bit (16,777,216) color display. You can set to any color or animation. Its put on a small PCB board that allows you to solder it in whatever configuration you want. Its easy to wire up and control. You just need one digital pin plus 5V and ground to control as many LEDs. The chainable design means no crossed threads. Works great with Adafruit NeoPixel Library ,ready-to-go library & example code for the Arduino UNO/Duemilanove/Diecimila, Flora/Micro/Leonardo, Trinket/Gemma, Arduino Due & Arduino Mega/ADK, FastLED library and Raspberry Pi. It works almost the same as NeoPixel and has superior quality but it is much cheaper than NeoPixel. IC Model: WS2812B the gray level: 256 Beam angle: 120 Power: 0.3W  0.01% plate: aluminum plate Waterproof: IP30 non-waterproof The standard operating voltage: <span class="a-text-bold">DC 5V </span> FPCB board size: Width: 10 mm, thickness: 3mm Model: WS2812 pixel board  light source: SMD 5050 RGB Color: full color, can be adjusted by the controller as follows: white, red, yellow, blue, green, etc. Integrating control circuit and RGB chip Built-in signal reshaping circuit Built-in electric rest circuit and power lost reset circuit 256 brightness and 16777216 color display Cascading port transmission signal None of the LEDS are connected through  the PCB. So you need to solder them based on your requirement. There are  6 solder points on the back of LEDs. Arduino is not included. 100pcs WS2812B LED mounted on Black PCB Board