This product is a handheld do machine producing 125KHz RFID cards, which can easily save the 125KHz ID card number. Therefore, you may receive the same pair of do identification cards for other purposes, such as access control identification, attendance control, etc. Features: Independent operation, without the need to connect do computer or PC. Built-in transceiver antenna, high sensitivity and fast read and write speed. Manual shape, 2 buttons for easy operation, convenient to use. Built-in individual LED diodes and buzzer indicator indicating the procedure of operation. Support for do writing: T5577 or EM4305 or 5200 or 8265 or 8268 or 8800. Reading system support: TK4100 or EM4100 or EM4200 or TK4100-D . . Technical data: Battery powered: 3 V (2 x AAA battery) (batteries not included) Temperature: -20-50 Lifetime: 15000 times Reading distance: 0 - 6 cm Size: 11.5 cm x 7 cm x 3 cm or 4.5x2.8 x 1,2 inch Package Weight: 106 g or 3,7 oz List of packages: 1 x RFID handheld copier (batteries not included) 5 x Writable RFID Keychains 1 x User Manual Please note that this type of chip card leaves the factory as an empty card and must be saved before it can be read.