EL wire is a thin copper wire coated in a phosphor which glows a 360 degree unbroken light when an alternating current is applied to it.It is bendable as a thin neon tube which makes it ideal for flexible decoration.Features:The Light controller takes 2 AAA batteries and has 3 settings:When you press the button・ you would find the the light has three modes: constant light・ fast flashing light and sound flashing.Music Sound activated ( means the tie will work when have Music or sound ).The battery pack can clip to anywhere on your upper body. I clip it to my belt or put it in my pocket.Can be used on any Occasional such as Un Occasional・ Rave Parties・ Discos・ Clubs・ Haloween ・Birthdays・ Festivals and Events.NOTE:Don't buy cheap knockoffs that use 2 watch batteries. They often only last 15 minutes before dying!