Using these NeoPixel diffused 5mm through - hole LEDs is easy. First, power them with 5V. To connect them, tie the Data - Out pin of one LED to the Data - in of the previous one in the chain. If you're using an Arduino, you can control them with our specially written Neopixel library. They also work well with our Trinkets. Remember, these LEDs are in 'RGB' format, so if you're used to 'GRB' ones, check the NeoPixel example code to swap the colors. As for maintenance, keep them away from excessive heat and moisture. Don't forcefully bend the legs as it may damage the internal connections. If you're not using them for a long time, store them in a dry and cool place.