1. STRONG COMPATIBILITY: Connect sound codec, CAT control, and switch to a computer via a single USB connector. Compatible with for Wins, for OS X, for iOS. No drivers needed. 2. FULL FUNCTIONALITY: Works with for FT8, for FT4, for JS8Call, for RTTY, for SSTV, for WinLink, for APRS, for VaraHF, for VaraFM, and for Soundmodem. Allows full CAT control in powerful transceivers and adjustments for HT and basic mobile radios. 3. HIGH RELIABILITY: Prefabricated transceiver cables are available for popular for , for Xiegu, and other popular brands, giving you a professional and user experience. 4. INTEGRATED INTERFACE: Combines sound card and serial port into one. Supports TTL/232 levels, USB serial control, and flexible connection to different devices with dual 3.5mm 4 pin jacks. 5. VERSATILE SOUND AND SERIAL PORTS: Defines sound input and output, PPT control (USB serial control, non sound), and serial port input and output (default TTL, can be changed to 232) Item Type: Integrated Digital Modes Interface Power Supply: USB Powered Interface: 1 x Sound, 1 x Serial Colour:As Shown Material:Plastic Package Contents: 1 x Extension Module 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.