Information exchange between transponder and reader can happen with various methods.
Slow RFID systems can operate with a small range which can be measured like in few meters in a frequency range of 120 to 150 kHz. For example, it is used for object identification and data production determination.
Higher-speed microwave RFID systems operate at a long range which is up to 200 m and in a frequency range of 3.1 to 10 GHz.
Source:- industry-of-things