Features: The RS232 Cable connectings your computerized telescope to a laptop or PC for control via various software programs. The RS232 Cable is used to connect your PC or computer to computerized telescopes via a port in the hand control. The large adapter attaches to the serial port of your computer. If your computer not have serial port, you will need Serial-to-USB cable, so that you can connect the RS232 Cable via USB port instead. The other end of the cable terminates in a phone, and simply snap into the port for this purpose. Attaches to the computer’s serial port and the telescope hand control via a phone. The RS232 Cable is also necessary for flash upgrades to hand control software. Specifications: Materials: ABS metal Length:1.8meter/70.87inch Package Includes: 1PC DB9 to RJ9 Adapter Cable note: Please allow 0-1cm error due to manual measurement. you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.