Product Advantage: Programmed with FC & number, can be directly used as H10301 Wiegand26 bit card or re-writable on FissaiD 125KHz writer Functions: 1.Buyer can directly use it as 1326 keycard or 1346 keyfobs. 2.To be copied with existing card number（125K Proximity 1326 family card format or EM format）by FissaiD 125Khz writer(ASIN:B07XJZ1J7B /B07QDJJ27ZP /B07QFMJTMV) Declaration As a professional supplier in this field, we put great effort to intergrate the best function in a tiny design. The keycards are produced in stable quality and it will not be damaged in normal use, means if buyer brought fobs, it should not be returned. But we got a few returns with no sensce resaon. As you know, Amazon service team is short of man power & technology to adjuge the reutrned goods status, so 100% returns are destoryed as rubbish. We don't like it happened! Before ording, Pls. read information carefully: 1. The cards are accessories of FissaiD 125K writer(ASIN:B07XJZ1J7B/ B07QDJJ27ZP /B07QFMJTMV), they are not writable by OTHER 3rd part writer due to we put high secure technoligy to prevent it 2. If you are not using the cards as 1326 or 1346 keyfob, don't buy it 3. If you don't have FissaiD 125K writer(ASIN: B07XJZ1J7B/B07QDJJ27ZP or B07QFMJTMV), dont' buy it We also understand that it is possilble a few people seek to use the product free(after using or finished project they returned product before Amazon return close window). Under this situation, As a seller we can do nothing due to it is rule from Amazon, we have to accept this to happen. But as a product designer, I despise and blame the guy who make it to happen, the unrespected behavior break the fair-mindedand of business and it gets nothing except created more garbage into the world just becaue a selfish guy seeks profit in it! We absolutely disagree that this should happen.