Only differed by frequency, wavelength but they are all fundamentally done by light, is that right?

When you put a physical credit card or stored value card near a payment device provided by the merchant, is it using the identical technology as that when you put your mobile phone close to the device and pay with your mobile phone without physical card?

Edited November 8, 20223 yr by kenny1999

WiFi uses 2.4 GHz and 5 GHz (with 20 and 40 MHz channel widths)

NFC/RFID use 13.56 MHz.

https://en.wikipedia.org/wiki/Near-field_communication

https://en.wikipedia.org/wiki/Radio-frequency_identification

(I suggest reading Wikipedia)

 

Edited November 12, 20223 yr by Sensei

Most is electromagnetic, but some wireless technology uses sound waves.