13.56Mhz Desfire EV2 4K Card Blank Card Chip: D43/D83(DESFire EV2 4K) Usable capacity:4KB, 7 bytes UID, Block 0 can't writtableProtocol: ISO14443AWorking frequency: 13.56 MhzSize: 85.5*54*0.860.04mmMaterials:PVCColor: White & Blank Package: 5/10 pcs/Lot Reading range: 5-10cmOperating temperature: -20 to 75 'CRead&write time: 100,000timesData retention: ≥10 yearsReading Range：1-10cmNotice: UID Block 0 not rewritable, This tag can't write throuh NFC Phone, you will need a special writter to write inside. 1. How do you guarantee your quality?60% of Newbega RFID products export to the UK, Spain and US, customer satisfaction is the proof of our products quality. All our products would be 100% inspected before shipping to you. If you found any quality issue, we will 100% refund you!2. How long time do you send out if I pay my order?Normally we will ship out within the next day since we have all them in stock, but if sometimes stock running out, we will always sending out within 3 working days!3. What would be the MOQ if I want to customize my products like numbering and LOGO Printing?The MOQ for most of our products is only 100 pieces, if you have any needs, you can contact our customer service team, our team members will respond to you within 24 hours. 4. What service can I get from you if I become your customer? Newbega is an expert RFID products manufacturer especially based on B2B, if you need any assistance, our after-sales team willing to help you within 24hrs. If you need any technical support, please free to contact us.