1. The string can be used as one, and be connected (as much as ten light strings to form 100m string light). 2. Certificated by FCC/ROHS/EMC/LVD. 3. Total 100 led light string. 4. There are 7 different colors to choose from: white, warm white or gold, blue, green, red, yellow and mix-color. Notes: You can distinguish the color by color point on the light control. Keep the string from dampness or rain,for the light string is not waterproof.