KEYSCAN 4KITB125 CA4500 KIT WITH 50 CARDS & 4 K-PROX2 READERS KIT COMES COMPLETE WITH 1-CA4500 CONTROL, 4-K-PROX2 READERS, 1-CS125-36 (PACKAGE OF 50 CARDS - HID COMPATIBLE) CARDS, 1-SYSTEM VII (BASIC) SOFTWARE AND 1-USB-SER USB-TO-SERIAL CONVERTER. INDIVIDUAL KIT COMPONENTS CANNOT BE RETURNED FOR CREDIT