These M1 RFID key fobs are perfect for access control systems in apartments, offices, parking garages, and more! Each fob operates at 13.56MHz frequency and comes in a compact 45x31x5mm size that easily fits on your keychain. The red ABS plastic construction with stainless steel key ring is durable, waterproof, and designed to last through daily use. Important note: these are read-only tokens, meaning they can't be reprogrammed or rewritten once encoded. You'll need to have your property manager or system administrator add them to your access control system - individuals can't set them up directly. The package includes 6 identical fobs, so you can keep spares or share with family members. They're widely used for building entry, elevator access, parking systems, public transportation, and hotel room entry. The small size makes them super convenient to carry, and the sturdy construction means they won't break easily. Just remember - these need to be activated by whoever manages your security system before they'll work. A cost-effective solution for replacing lost fobs or adding additional access tokens to your existing system!