Our classic diamond cut faceted C9 bulbs are versatile and durable, suited to both indoor and outdoor use. The 25 high-efficiency, Energy Star-rated LED bulbs are environmentally friendly, remain cool to the touch, and reduce power usage. Each 16' 7" strand has plug-ins at both ends, allowing you to link multiple sets of lights together. Each set comes with a spare fuse and 2 spare bulbs to ensure your Christmas stays bright.