Please select one item from ① to ⑦ in the image. These are Mifare Classic 1k standard RFIDs that can be used with smart locks from various companies such as Sesame Touch, SwitchBot, and Akerun. The UID is not printed, so security is excellent. Operation has been confirmed with dedicated reading devices. Shipped via anonymous delivery as they are intended for security purposes. ① to ⑤ are key fob types that can be used as keychains or tags. ⑥ is a credit/cash card-sized card with a thickness of 0.8mm. ⑦ is a card of the same size as ⑥ with a strap hole and a thickness of 2.0mm. Standard: ISO-14443A Frequency band: 13.56MHz UID: 4 bytes (8 digits) *If you are unsure of compatibility with your device, please provide the model number and we will investigate. *For bulk orders, we offer a separate discount, so please inquire.