LED Fairy String Lights--BLUE Lights 10 sets 3 lights- for Inside Eiffel Towers and Flowers Each String has 3 lights--each Light is 3/16" across- tiny LED lights are specially designed for using in places that have no power supply-and lights are OK in WATER. BLue Lights with CLEAR Cords and a small battery box for the top of the vase-don't put battery pack in water. Battery Box is 1/4" thick x 15/16" wide x 2" long and holds two CR2032 batteries. The unit will stay lit for 10-16 hours. Length of Clear cord is 21" Long. Lights are Spaced at 7"-14" and 21" from Battery Box. ALSO please note inside Clear vases need something, water pearls, cellophane, colored water for the lights to bounce off. White vases better.