Product Description: Integrated Digital Modes Interface for Amateur Radio - USB Sound Card and Serial Port All In One USB Connectivity: Experience seamless integration with our 2-in-1 digital modes interface, combining a sound codec, CAT control, and switching capabilities through a single USB connector. This device is compatible with Windows, OS X, Linux, and Android systems, requiring no additional drivers for effortless setup and operation. Wide Frequency Support: Designed to cater to HF, VHF, and UHF frequencies, this interface supports a variety of digital modes including FT8, FT4, JS8Call, RTTY, SSTV, and APRS. Enjoy full CAT control and reliable HT adjustments, enhancing the performance of advanced transceivers and ensuring smooth communication across different bands. Versatile Integrated Interface: Our product features a comprehensive sound card and serial port combo, supporting TTL 232 levels and USB serial connections. With dual 3.5mm plugs and a 4-pin function definition, it offers flexible device connections and broad compatibility, making it an ideal choice for diverse amateur radio setups. Customizable Sound and Serial Definitions: Tailor your experience with defined sound interfaces and USB serial control. The default TTL input and output can be easily switched to 232, providing users with the flexibility to adapt to various operating conditions and preferences. Expandable Features with 3.3V Output: Future-proof your setup with the included 3.3V voltage output and a reserved expansion port for additional functionality. The default 3.3V output is off, ensuring stability while offering customization potential for advanced users looking to expand their system capabilities. Enhance your amateur radio experience with this integrated digital modes interface, designed to provide superior connectivity, flexibility, and performance. Whether you're a seasoned operator or a hobbyist, this device offers the tools you need to explore and enjoy the world of digital communication.