COMPATIBLE AUTOGUIDER CABLE ST4 RJ11-6P6C KABLE Fit Compatible PLANETARY TO ASTRONOMICAL TELESCOPE EQUATORIAL MOUNTWhen in use, connect end of the ST4 cable to the ST4 guide port of the guide (such as ZWO Zhenwang, QHY and QHY5-II QHY5 etc),and the other end to the GUIDE port of the equatorial mount. In the guiding software, select ST4 guiding mode, you can guide the star. You can also use Firecapture to guide stars when shooting planets.Package Contents:1 X RJ11 toRJ11 ST4 CableLength: 1.0M/3.3FT, 1.8M/6FT, 3.0M/10FT, 5.0M/16.4FT(Approx.)If you receive the goods, and have any dissatisfaction or need assistance, please feel to me or leave me a message.