The RFID key fobs or key rings is small and durable,made of ABS.It is waterproof and anti-fall without fading. Custom LOGO, QR code, barcode, serial number or other customized crafts can be printed on the key fob both side, creating a beautiful look for you and your custom. The RFID chip response frequency includes LF (125KHz), HF (13.56MHz), and Ultra-High Frequency (915MHz). It is widely used for access control, attendance, identity authentication, payment, etc.