I created a super short demo on the PFC 2400 HD showing how to set a specific frequency using the dials
If you're located within the US you can order one here:
https://www.chi-card.com/orderinfo/c_paypal.html (https://www.chi-card.com/orderinfo/c_paypal.html)
There is a list of frequencies to experiment with available in the manual which can be downloaded here:
https://www.akor.cc/manuals/english/manual.pdf (https://www.akor.cc/manuals/english/manual.pdf)