This product has disposable batteries.
Turning On/Off
The silver cylinder at the top of the earring (with the hoop attached) can rotate.
To turn on the LED, rotate clockwise (tighten) the earring.
To turn off the LED, rotate counter-clockwise (loosen) just enough. Do not fully unscrew the top!
Replacing Batteries
Each earring requires 3x LR41 (coin) batteries, which should last 12+ hours.
To replace the batteries, fully unscrew the top of the LED. Replace the existing batteries (flat side of the battery toward the screw-top) and secure the top again.
Safety
These are dust-proof & waterproof earrings.
The clear plastic band around the tube protects against most situations (except full submersion in water, or other extreme situations).