Sold per pair.

LED Colors: Red Blue Green

Modes: Color Change and Flashing function only

Battery: 2 replaceable AG0 Batteries. To replace batteries, carefully unscrew the back of the battery housing. The batteries are very small, so keep a close eye on them.

Features:

Batteries are in the earring backer.
Insert earrings, connect backer - when backer makes connection to earrings, earrings will light up.
Runtime is 3+ hours.