Draft for the manual:

Txx.uo

Txx.uo consolidates two contrasting radio frequency implementation modes: RFID reader scans the cards/objects with RFID tags using radio waves and LCD screen displays a Q-code* [internationally established three-letter abbreviation used in radio communication].

*A particular Q-code denotes a question when it is followed by a question mark and references an answer [statement] when it's not:
QRU? : Have you anything for me?
QRU : I have nothing for you.

The RFID technology is used for object identification, authentication and security reasons, whereas Q-code is transmitted on a specific radio frequency by a radio operator and can be intercepted by anyone, who is tuned in to the same frequency.

This module converts the data of a scanned card into a sound and binary code. The latter makes the LED blink and sends the corresponding signal to another module through an output channel. Top row of an LCD screen displays a specific question from the list of a Q-code, depending on a knob position and if the module is receiving a signal via the input jack, a random answer is shown on the second raw of the screen.