High sensitivity: operation without connection to computer/PC required. Built-in transceiver antenna, high sensitivity and fast read and write speed. Handheld design with 2 buttons for easy operation, comfortable to hold. Easy to use: built-in individual LED indicators and buzzer provide feedback for operation status. Supports EM4100 and EM4200 chip types. Compatible with 125kHz EM4100, EM410X, or compatible card/tag formats (not compatible with HID standard). Multi-function: allows reading and writing of ID card data for various applications. Easy to copy: this ID card reader is a portable 125 kHz RFID device that can read and write 125 kHz ID card numbers. Color: blue Material: plastic Package Contents: 1 x RFID handheld copier (batteries not included) 5 x rewritable RFID keyrings Note: Light and display differences may cause slight variation in color between image and actual item. Measurement error allowed within +/- 1-3 cm.