Handheld shape design, comfortable hand feeling and . 2 buttons for simple operations. Standalone operation, no need to connect with computer / PC, easy to use. Built-in individual LED lights and buzzer indicator. Reading distance is 0 - 6cm. Can only copy 125KHz RFID card, Compatible with T5577, 5200, EM4305 ,EN4305. Parameter: Read: 125KHz ID (EM4100 TK4100 etc) cards or keys Write: 5200/EM4305/T5577/8310/8268 etc cards or Keys Built-in: individual LED lights and buzzer indicator, transceiver antenna Power Supply: 3V (2 x AAA battery) not included. you can buy battery on your side Times: Read / Write Greater than 20000 times Note: All products undergo testing before shipment to ensure quality. If not read the card, the card should be belong to the not supportable type card. If not write the card, the card should be belong to the not supportable type card or not writable type card. Above two status, they are not the device's problems, please note that. Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Type:125Khz RFID Card Reader+3 Keyfobs+2 Cards Kit Colour:Blue Material:Plastic Package Contents: 1 * RFID Card Reader Kit