ER CHEN(TM) Indoor and Outdoor Waterproof Battery Operated String Lights on 4M PVC String with Flash Function (Blue) 40 Super Bright LED Lights on 13 Feet Long PVC Wire with 4 Inches Distance Between LED Bulbs. Lights Have Over 20 Years of Life Span and Use Fraction of Energy Needed by Regular Light Strings. They are also much brighter than Starry Lights or Fairy Lights. Newest Indoor and Outdoor Weatherproof Transparent Battery Box with ON / Flash/ OFF Feature Requires 3*AA Batteries (Not Included). It Has Locking Clips to Easy Open and Close the Box. Can last for 40000+ hours! IP65 waterproof led allows the lights working even in rain! 6 months warranty and 2 weeks money back grarrantee by ER CEHN(TM)