This is 125 khz RFID with read capabilities that can be easily connected to your computer through usb. It work under windows and need no driver and no need for power supply as it is powered by the USB. It very simple to use either directly write to any open application such as word or excel where the ID of the card you read will be written directly to the application. The other method is to download the application below where you can use it to read your RFID card.