AYAMAYA 1 Pair Led Earrings Drop Crystal Light Up Glowing Studs Ear Ring Dance Party Gift (Purple) Material: Stainless steel earring with Cubic Zirconia stone ; Size: Approx.8mm(diameter)*15mm(Length) To activate your Light Earrings, push the earring through your earlobe's pre-pierced hole and firmly attach the other half on back, light will turn on and stay on. Steady light function only. The glowing earrings are perfect for concerts, parties and sporting events. They look amazing in the dark and really light up the room and people's eyes with positivity. Just be ready for some compliments! Wear the sparkling crystal earrings during the day. Then turn the LED light on at night or when it's time to have fun! Replace batteries ( 2*LR521 ), lasts over 30 hours. To replace batteries, carefully unscrew the back of the battery housing. The batteries are very small, so keep a close eye on them.