This device is used to copy and duplicate the 125 Khz EM4100 ID Card for backup purpose. Excellent program algorithm and circuit design are adopted. You can copy all ID(EM4100) Cards with this RFID copier. Portable size, easy to carry. Features: 1. Mini-type handheld mold, ergonomic characteristics, easy to carry. 2. Only "Read" and "Write" two buttons, easy to operate. 3. You can copy all ID(EM4100) cards with this RFID copier. 4. Adopting advanced chip, product integration is higher, more stable and reliable. 5. Excellent program algorithm and circuit design reduce the power consumption and prolong battery life (Battery is not included in the package). 6. Widely used at community, school, office and other access control needed places. Specifications: Frequency: 125 KHz ID single frequency reading and writing copier Support Reading Chip: TK4100/EM4100/EM4200/TK4100-D Support Writing Chip: T5577/EM4305/5200/8265/8268/8800, etc. Copy Times: >20,000 Times Battery Type: 2 x AAA Battery (Not included) Size: Approx. 11.5 x 7 x 3cm / 4.6 x 2.8 x 1.2in Weight: Approx. 162g Package List: 1 x RFID Copier Without Battery 6 x Writable Key Tags 6 x Writable Cards (EM4305) 1 x User Munual