1PC Handheld 125Khz RFID Copier Copy Writer for EM4100 EM4305 Card Tag Keychain Kit Set 02 We don't offer color choice. Your order will be sent in colors at random. Copy and duplicate the 125 Khz EM4100 / EM410X card /tag ID for backup purpose. Support 125Khz EM4100 / EM410X or compatible card /tag format only (HID standard NOT compatible!). 2 buttons for Simple operations. Standalone operation, NO need to connect with computer / PC. Easy to use: 1. push the read button to read the card. 2. take a new card and write on it. Very easy and comvenient.