Sound Responsive Neon El Wire Kit - 4 Lines, 5 Feet Each (20 Feet Total) (Blue - Red - Pink - Aqua) This el wire kit has 4 line of el wire 5 feet long each for a total of 20ft of el wire. The Sound Responsive battery pack lights the el wire up to the beat of the music. There is a scroll bar that lets you adjust the sensitivity of the Sound Responsive battery pack. The size of the el wire is 2.3mm. The el wire comes soldered, so there's no work on your part to light up the el wire! The sound responsive Battery Pack takes 4 AAA Batteries.