When I say "Made in Ohio", that means that these earrings were completely designed and assembled in Ohio by me! I designed the circuit board using CAD and EDA programs, I assembled all the parts myself, and I package them myself. This project has been in the works for over 3 months, has gone through 3 prototypes, and countless hours of research. I hope the end product is not a disappointment! Each order comes with two sets of batteries so you'll be ready for hours of fun. These are best for night or indoor activities since their brightness is limited due to their size. Light weight! Each earring weighs less than a penny! (With battery) 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. Stainless steel hooks included. (If you want a different color hook just send me a message and I will let you know what other options I have in stock. I usually have Gold and Black) Earring material is PCB or printed circuit board. It is coated in lead free tin mix, uses lead free components, solder, and cleaning materials. Thanks Designed and hand assembled by RPTech.