Radio Frequency Identification (RFID) uses radio frequency waves to transfer data. Placing RFID tags on people or items allows a Reader to wirelessly identify and track them without any physical or visual contact. RFID transmissions make use of different types of frequency: Low Frequency (LF) range allows distance reading up to 10cm; High Frequency (HF): 10cm to 1m, and Ultra-High Frequency (UHF): up to 12m. Applications include: LF = access control, vehicle carpark tracking, livestock tracking; HF = electronic ticketing, attendance tracking, smart cards, card payment, hotel key card, security access; UHF = retail inventory tracking, medical supply inventory, anti-counterfeiting.
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