This is a blank 13.56MHz RFID/NFC keychain fob. The fob contains a small RFID chip and an antenna, and is passively powered by the reader/writer when placed a couple inches away. These can be read by almost any 13.56MHz RFID/NFC reader but make sure it can handle ISO/IEC 14443 Type A cards as there are a few other encoding standards (like FeLica) They are tested and work great with both our 7:43)Technical Details RFID chip specification: * 1 KiloByte (8 KiloBit) non-volatile EEPROM storage * Built in encryption engine with 48-bit key * 4 Byte unique identifier burned into the chip * 13.56 MHz frequency Tag specification: * 38.39mm / 1.51" x 38.39mm / 1.51" x 5.04mm / 0.2" * 8.68g * Works about 2" away from reader https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2023-03-06 https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2023-12-27 https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2024-09-19 https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2024-11-29 https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2024-11-30 https://elecena.pl/product/22711142/13-56mhz-rfid-nfc-leather-keychain-fob-classic-1k-discontinued 2025-04-09