Replacement segment! In the String Lite, the light points are directly fixed to the carrier cable. A chain usually consists of several segments. With the help of the patented QuickFix system, up to 16 chains can be easily connected together. The individual segments feature 35 patented LED light points and 5 flash LEDs. Each segment is replaceable. Mercury content (mg): 0, switching cycles: over 15,000, ignition time/start time (s): under 1, light output retention: at least 70%.