Need to program your own access cards or clone existing ones? This 5-pack of 125kHz RFID key fobs is perfect for that. They use the common EM4100 protocol and are rewritable, meaning you can program them with a compatible RFID writer to work with many door access systems, time clocks, or even older copy machines. They come as blank key fobs, unbranded, and ready for you to encode. Super useful for property managers, small businesses, or tech hobbyists who want to make spare keys or set up a simple access system. Just make sure your existing reader/writer supports 125kHz and the EM4100 standard. A cheap and effective way to manage access without buying expensive pre-programmed cards. Keep a few spares on hand – you'll be glad you did!