Simplify access control with MIFARE Classic� 1K NXP EV1 27mm circular stickers that are tamper-proof. These stickers come with Classic 1K chip and have a 10cm range, which can vary based on the reader's power. You can use these stickers right away and attach them to mobile phone cases, wallets, or plastic cards.Product Specifications:Sold in packs of 100Operates at 13.56MHz FrequencyDimensions: 27mm x 27mm