This leather key fob is shaped as contains a small RFID chip and an antenna, and is made of PU leaitther,which is designed and easily to carry with a luxury and unique appearance.Available chip types varies from LF（125KHz）to HF（13.56MHz）,widely used in door access,such as hotel,apartment,tranportation, VIP identification etc.13.56Mhz RFID Access Control Keypad Card Reader for Door Access Control System Smart Door Lock Access Controller It is a widely used access control system entrances and exits at offices, factories, hotels, schools and other public l input/output uses anti-jamming protection and over-voltage/circuit protection.13.56mhz and 125khz Dual Frequency RFID Key Fob For Hotel Access Control Lock Manage your keys or eliminate thempletely. Bring highly visible branding to your event, gym or club. RFID key fobs and tags are made for RFID access control, RFID key tagging and RFID key management.Read only. Not re-writable. Each key fob is already pre-programmed. You cannot re-program them by a card writer. Compatible with MIFARE Classic 1K Card (M1 Card). If your lock uses M1 card, these key fobs work for your lock too. Suitable for 13.56MHz RFID proximity access control system and ID management system.