HID 10301 125Khz Frequency RFID Proximity Card Cards provide a cost-effective way to add proximity access control to your organization. The 10301 HID proximity access card is about the same size as a standard credit card CR80 85.5*54MM, and can easily be carried in a wallet, badge clip or badge reel for convenient applicability to access control systems. 26 Bit 10301 Format 125KHz HID Proximity Cards - Does not require that a HID facility code or HID card start number are specified by the customer when placing an order. HID controls card numbering, ensuring that card numbers are never duplicated.