OKIDOKEYS Smart-Reader Access Assortment Pack 3  Wristbands, 3  Cards & 3 Keychains For Use With OKIDOKEYS BLE & RFID Smart-Locks and Smart-Reader - TTM901USTR Unlocks doors using RFID technology Two levels of data encryption to ensure security Requires an OKIDOKEYS Smart-Lock and Smart-Reader 3 Cards, 3 Wristbands and 3 Key chains