JYtrend(TM) Neon Glowing Strobing Electroluminescent Wires (El Wire) + Controller (Blue 10ft) Flexible Battery Pack Controller (4 Modes: on/off Mode, Flash Mode, Fast Flash Mode) Great for Parties, Costumes, Decorations, Christmas, Car, Light Signal Energy saving. Require 2"AA" Batteries (not included) Water resistant and weather durable