Features:Copy and duplicate the 125 Khz EM4100 / EM410X card /tag ID for backup purposeSupport 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!!Built-in individual LED lights and buzzer indicatorBuilt-in transceiver antennaBattery power supply : 3V ( 2 x AAA battery) (Batteries not included)Small & Protable design : (115 x 70 x 30) mmRead / Writable card & keyfobs can be cloned and copied > 20000 times with difference IDsNote: this duplicator only can copy 125KHz ID cards/tagsPackage Included:1 x RFID 125KHz EM4100 handheld copier6 x Writable RFID cards6 x Writable RFID key tags