CR333 is a contact smart card reader that combines smart card and SIM card functionalities. It has a smart card slot and a SIM card slot, supporting individual use but not simultaneous use. It supports A, B, and C class (5V, 3V, and 1.8V) smart cards compliant with ISO 7816 standards and communicates with PC environments through a USB interface compatible with different operating systems. USB Smart Card Reader Detection: This SIM card reader features motion detection, automatic power-off for smart card types, automatic short circuit detection, and thermal protection functions Ease of Use: Simply insert a card for authentication. It includes a one-click operation interface to help users complete various operations faster and more accurately Safe and Durable: The CAC card reader is made from high-density, eco-friendly ABS material, ensuring safety and long-lasting use Wide Compatibility: This practical smart card reader is compatible with multiple operating systems, including Windows, Linux, and for MacOS Versatile Applications: Suitable for various smart card operations, including digital authentication and security, network ATM transfers, payments, balance inquiries, taxes, and utility payments Specifications: Material: ABS Dimensions: about 66.5*64*12.5mm/2.62*2.52*0.49 inch Cable Length: about 80cm / 31.5 inch System Support: Microsoft Windows XP and above Linux Fedora FC8 and above For Mac OS 10.6.2 and above