The Usangreen FTDI USB to RJ9 4P4C RS232 Serial Converter Adapter Cable for Celestron Nexstar EQ6 Telescopes PC USB is designed to provide a reliable and versatile solution for connecting PC and Celestron Nexstar EQ6 telescopes. This high-quality adapter converts the USB port on your computer to a standard RS232 serial port, enabling you to connect Celestron's PC USB to connect hand control box to your PC for remote operation. Its robust construction and RJ9 connector ensure secure and stable data transmission, even in harsh environments. The adapter is compatible with Celestron Nexstar EQ6 telescopes and is easy to install, making it an ideal choice for both amateur and professional astronomers.