These pendants are all completely unique one-of-a-kind pieces composed of wood grain finish polymer, Hunab Ku cabochon & Slow Fade (Color Changing) micro LED light. 
Batteries are cheap and easily replaceable. 
 
Pendant runs on 2 CR-927 batteries.
To activate pendant: turn dial on backside of pendant clockwise. To replace batteries: Turn dial on backside counterclockwise until it unscrews completely. Remove and change batteries  Pendant runs on 2 CR-927 batteries