High sensitivity: independent operation, no connection to computer/PC required Built-in transceiver antenna, high sensitivity fast read write speed H shape design, 2 buttons for easy operation, comfortable for you Easy to use: built-in individual LED indicators buzzer display indicate the operation of your operation Supports EM4100 EM4200 versions Supports only 125kHz EM4100/EM410X or compatible card/tag format (HID stard NOT compatible ) Multi-function: you can get the same pair of HID ID cards for other purposes EASY TO COPY: This ID card reader is a portable 125 kHz RFID card making machine that can easily copy write the 125 kHz HID/ID card number Colour: blueMaterial: plasticPackage Contents:1 RFID h copier (without 2AAA batteries)5 rewritable RFID keyringsOnly the above package content, other products are not included Note: Light different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is 1-3cm