High sensitivity: operation, no connection to computer/PC required. Built-in transceiver antenna, high sensitivity and fast read and write speed. Hand shape design, 2 buttons for easy operation, comfortable . Easy to use: built-in individual LED indicators and buzzer display indicate the operation of your operation. Supports EM4100 EM4200 versions. Supports only 125kHz EM4100/EM410X or compatible card/tag format (HID standard NOT compatible!). Multi-function: 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 making machine that can easily copy and write the 125 kHz HID/ID card number. Colour: blue Material: plastic Package Contents: 1 * RFID hand copier (without 2*AAA batteries) 5 * rewritable RFID keyrings 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.