Designed to read 125KHz RFID cards and write/program 125KHz writable RFID cards and keyfobs - Lower voltage operation design powered by 2 PCs 7#（AAA alkaline batteries） - Handheld portable mini appearance easy to carry easy to operate Operates without the need of PC or laptops -- works completely standalone two buttons operation. Simply press the button “read” to read existing RFID card. Then press the button “write” to program your blank RFID card - The included programmable RFID cards are completely reusable -- can be written over and over again - Perfect for copy existing RFID pass cards and keychains