High Sensitivity: operation, no connection to computer/PC required. Built-in transceiver antenna, high sensitivity and fast read/write speed. Handheld shape design, 2 buttons for easy operation, convenient. Easy to Use: Built-in individual LED indicators and buzzer display indicate the operation of your operation. Supports EM4100 EM4200 versions. Only supports 125kHz EM4100/EM410X or compatible card/tag format (HID standard NOT compatible!). Multifunction: you can get the same pair of HID and ID cards for other purposes. EASY TO COPY: This ID card reader is a portable 125 kHz RFID card manufacturing machine that can easily copy and write the 125 kHz HID/ID card number. Color: Blue Material: Plastic Package Contents: 1 * RFID Handheld Copier (without 2*AAA batteries) 5 * Rewritable RFID Keychains Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm.