writable chip: EM4305 (125KHz) | Excel, Word, or Notepad needs to be open to read the cards
chip type: EM4100 (125KHz) | only readable | code printed on the card (serial allocation) | ISO/IEC 7810 ID-1 size, thick
chip type: EM4100 (125KHz) | only readable | code not printed on the card | Wiegand 26-bit | ISO/IEC 7810 ID-1 size, thin
readable chip: EM4100, EM4305 (125KHz) | writable chip: EM4305 (125KHz) | powered by 2 AAA batteries