Operating frequency 13.56MHz (TK4100) Only Read Each card with Unique UID number operative standard: ISO11784 Detailed Product Description 1. Double side printable. Compatible to any kinds of ink, including normal waterbase dye ink and pigment ink. 2. Waterproof and glossy. 3. Can sign direct to pvc card using pen. 4. High Quality 5.No need to cut, No need to Laminate. You could be quick,easy,customized and professional to make ID card. Questions: 1. Ask: If the inkjet pvc card double side printable ? Reply: Yes,double side printable 2. Ask: If need the specifical ink ? Reply: No, Normal dye ink or pigment ink that you use as usual. 3. Ask: If I could sign my name on the card ? Reply: yes,you could write any word on the card with any type of the