T5577 chip Operation frequency: 125Khz Read and rewrite key tags Detecting distance: 0-7cm Erasable life: 100000 times Data storage:10 years Compatible with all Door Entry system Easy to carry Water resistant Can read and rewrite Compatible with all RFID reader to gain access key inductive card for entrance guard system. It applies to 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. Please notice:The 125KHz T5577 chip card Number is blank, so it can not be read before you write a data to it. Designed for the RFID 125KHZ duplicator. can copy all the ID card , such as Access Card , District Card , Parking Card and so. Colour:Black Material:Plastic Package Contents: 10 * Keyfobs Token Tags Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.