RFID contactless 13.56mhz 1k mifare keyfobs they can also be use as ISO14443A NDEF Compliant S50 NFC Keyfobs.
These keyfobs can be used for Asset tracking, Access control, Time attendance, etc... they are also fully programmable to work with NFC mobile phone such as Google Nexus S, Nokia C7, etc. fully compliant with NDEF protocol.