New RFID 125KHz EM4100 ID Card Copier Duplicator with 6 Writable Tags + 6 Cards 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!) Battery power supply : 3V ( 2 x AAA battery)?(Batteries not included) Small & Protable design : (115 x 70 x 30) mm Read / Writable card & keyfobs can be cloned and copied &gt; 20000 times with difference IDs