Philips 60ct Blue LED Faceted C6 String Lights Polypropylene, Wire, Polystyrene Indoor/Outdoor Use: Indoor, Outdoor. Bulb Type: LED. Light Bulb Shape: C6. Features: Connects End to End. Connect up to 45 Philips LED 60 light sets. Battery: no battery used. Lighted Length: 19.67 feet. Total length: 22 ft. 88% Energy Savings. Green wire. Cool to touch when lit.