Made in Ohio by a small business this one of a kind necklace is perfect for attracting attention and compliments at gatherings and parties. When making these I selected high quality Cree brand LEDs for superior brightness and battery life. Each order comes with a set of batteries so you'll be ready for hours of run time. If you plan to use it for more than the rated 8 hours then grab a few packs of the CR1220 batteries with your order. Silver plated chain Necklace material is PCB or printed circuit board. It is gold plated. And uses lead free components and solder.