... celebrationOEM/ODM orders are welcomed1.Item:flash pin badge2.Size :3-7cm diameter flashing pin 3.Material:plastic ,tin,led lgiht4.Offset ... .Used for promotion gifts1,How it works: Screwing the pin tightly, making the batteries connect with the PCB,the badges will start ... piece on opposite side.- We have Magnet ,Military Clutch ,Safety Pin for choosing .- Also you can select the switch button styles ...