Generally speaking, Wireless refers to "radio" or "radio waves".

Then a wireless product can be understood as a product that conducts contact, communication, control and other actions (or work) through "radio" or "radio waves".

Wireless products can be divided into wireless transmitters (Transmitter) and wireless receivers (Receiver) according to their functions.

Transmitter is generally referred to as Tx in the wireless field;

Receiver is generally abbreviated as Rx in the wireless field.

In real use, the two are integrated with each other and are indispensable.