Card-Tech 10pcs RFID 125KHz Writable Rewrite T5577 Proximity Access Key fobs key tags Operating Frequency: 125khz Read Distance: 2-10cm Package Content : 10 x T5577 Cards Material: PVC Compatible with all Door Entry system Typical Applications: Access control, hotel locks, staff attendance and school campus access and payment control, identification and security systems, parking lot entry and payment, social security management, transportation payment, municipal and ancillary service payment