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. Excellent program algorithm and circuit design reduce the power consumption and prolong battery life. Designed with a "Read" and "Write" two buttons, easier to operate. You can copy all ID(EM4100) cards with this RFID copier ID (EM4100) Access Control Card Replicator Copier with Premium Quality. Mini-type handheld mold, ergonomic characteristics, easy to carry. Adopted advanced chip, the product integration is higher, more stable and reliable. Portable size, easy to carry. Such a nice product, don't miss it Widely used at community, school, office and other access control needed places. We solemnly promise you that if you find problems with the product itself, you can contact us in time. we will definitely give you a reply in the first place and return it for you. please feel free to use it. Specification: Condition: 100% Brand New Material: Plastic Color: Shown as picture Size: 117 * 70 * 30mm / 4.6 * 2.8 * 1.2in Frequency: 125KHz Button: Read Button, Write Button Power supply: 2 piece AAA battery, it can be replicated 20 thousand times. Distance: The key reading distance can reach 2.5cm, and the card can reach 6cm. Cards: T5577\EM4305\CET5200 and all T5577, EM4305 compatible cards. Package Weight: Approx. 89g / 3.1oz Package Included: 1 * RFID Copier (Batteries are not included) 1 * Keyfob Usage method: Start the replicator. 1. Push the switch on the right side of the replicator up, the red light is always on, the green light and yellow light flashes, the buzzer sounds, indicating that the start-up is successful, otherwise it can be restarted once. 2. When the replicator starts, at this time do not read any card, and then press the replicator right-click to write the card, you can write the card into a full zero ID card, write successfully, buzzer beep 2. Copy ID card. 1. Push the switch on the right side of the duplicator up, the duplicator beeps, the green light and the yellow light flashes to indicate that the start-up is successful. 2. Put the old card on the left side of the replicator, press the left key of the replicator to read the card, and the reader beeps 2 times to indicate that the card is read successfully and the green light is on at the same time. 3. Change a new card, press the right button of the replicator to write the card, and the reader ticks 2 times to indicate that the card is successful and the yellow light is on, so that a clone card is made.