Specifications: Support 125Khz EM4100/EM410X or compatible card/tag format(HID standard is not compatible.). 2 buttons for simple operations. Standalone operation, no need to connect with computer. Built-in individual LED lights and buzzer indicator. Built-in transceiver antenna. Small and portable design. Can be cloned and copied above 20000 times with difference IDs. Type: RFID Copier Battery: 2 x AAA Batteries(Not Included) Size: 11.5cm x 7cm x 3cm/4.53" x 2.76 x 1.18 (Approx.) Notes: This duplicator only can copy 125KHz RFID cards/tags. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x RFID Copier 10 x Writable Key Tags