Three Line Sound Activated Neon El Wire Kit - Yellow, Orange, Green This el wire kit has 1 line of el wire 5 feet long with a Sound Responsive battery pack. 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 3 AAA Batteries.