This blinks 7 times per second like a real strobe light does. It flashes red, green and yellow. It is very dazzling and pretty. 316L surgical steel. Batteries not included. Many retailers carry these size batteries. Magnificent craftsmanship. This is not waterproof so don't wear it in the shower or swim with it. Perfect for clubbing, parties, costumes and raves. Novelty Jewelry. Clearance close out item.