EXCITED PROMOTION 1pc Light Up Led Earring Ear Stud Dance Party Accessories Color:Blue,Red,Green.White,Purple ,Rainbow (choose the one you like) Zircon Size:app 7mmTotal Length:app 2cm Battery:LR521 button battery (replaceable) Material:Stainless steel earring with Cubic Zirconia stone Weight:About less than 1g When u wear the earring,the light is on, pull out the post of the earring slightly,the light is off. f you feel a little more shy You can even turn the LED's off (by pulling out the post slightly) Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please consider before buying.