When two mobile devices use Near Field Communication (NFC), how close do they typically need to be to establish a reliable connection?
Up to 30 cm (1 ft)
About 4 cm (1.6 in) or less
Up to 1 m (3.3 ft)
Up to 10 cm (4 in)
NFC operates by inductive coupling at 13.56 MHz and is deliberately limited to very short ranges to reduce the risk of eavesdropping. For most consumer devices, the maximum practical distance is about 4 cm (1.6 in) or less; beyond this range the magnetic field is too weak for stable communication. Options that listed 10 cm, 30 cm, or 1 m describe distances associated with other wireless technologies such as RFID or Bluetooth, not NFC.
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