(Set/3) USB Rechargeable Color Change Bottle Lights Turn Empties Into Lamps Turn your empty bottle into a lamp! Just insert this special cork into the neck of your bottle, and twist on. Keep twisting to select from 7 colors to add the most beauty to your bottle. Recharge via any USB port. 2" x 1". WARNING: Choking Hazard - small parts. Not for children under 3 yrs.