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](https://www.centralite.com/products/international/4-button-key-fob/) can be personalized to arm security systems, illuminate scenes, and trigger events in your connected home system. 
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