How does a fob key work?

Key fobs use radio waves to communicate with a reader in the door latch that they are programmed to open. They use a system known as radio frequency identification (RFID), which operates like an electronic barcode for identification purposes. In some respects, it serves the same purpose as a barcode on a credit card. The Centralite 3-Series 4-Button Zigbee Key Fob can be personalized to arm security systems, illuminate scenes, and trigger events in your connected home system.