What is the difference between the two communication methods?

1) Near field communication

Communication method: RFID, NFC, Bluetooth, IrDA.

Communication characteristics:

RFID-Low frequency: The communication distance is within 1m, the communication speed is low, and the card is large.

RFID-high frequency: The communication distance is within 1m, the communication speed is medium, and the card is small.

RFID-Ultra high frequency: The general communication distance is 4~6m, and some active products can reach 30m.

NFC: With a communication distance of 20cm, it is easier to use and safer than RFID.

Bluetooth: The common communication distance is 10m, and the high-power products can reach 100m.

IrDA: High communication speed and strong anti-interference ability.

2) Long distance communication

Communication method: WIFI, 433M, 2.4G, ZIGBEE,3G.

Communication characteristics:

WIFI: Working frequency: 2.4ghz, communication distance: 50m.

433M: Working frequency: 433mhz, communication distance: 50m.

2.4G: Working frequency: 2.4ghz, communication distance: 50m.

ZIGBEE: Working frequency: 2.4ghz, communication distance: 50m.

3G: Working frequency coverage: 1.8ghz~ 2.4ghz; communication distance: extending through the base station, the signal is everywhere.