I Googled Dt systems and found they make dog collars. I do not see what they have to do with flip-flops.
You need to get a basic book on electronics to find out what flip flops do. They change two outputs over for each input pulse so can be used for a divide by two circuit and made into an array for more divisions.
I have the book "CMOS cookbook" by Don Lancaster which will give information.
Have you tried Wikipedia?