PR25 Programming

[lololola]

Hi.i've already soldering the components and tried out the source code.everything works fine and I'm trying to modify the source code.

I want to ask what is the function of:
unsigned char id1[2]={127};
unsigned int id2[2]={26935};
since i even modified it into:
unsigned char id1[2]={0};
unsigned int id2[2]={0};
it still can read the RFID card and save it as original source code.

And i've tried to save 2 RFID card but it only save one per time and remove the old card ID. Thanks