High sensitivity: operation, no connection to computer or PC required. Built-in transceiver antenna, high sensitivity and fast read and write speed. Hand shape design, 2 buttons for easy operation, comfortable for you. 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 or EM410X or compatible card or 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 or ID card number. Colour: blue Material: plastic Package Contents: 1 x RFID hand copier (without 2xAAA batteries) 5 x 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.