This cable allows you to connect the SPOX control module to the Alpy / LISA Calibration unit. This then allows the calibration unit to be controlled away from the telescope. Two lengths are available. A 0.8m length which is more practical if you wish to mount the SPOX on the telescope and connect its USB port to something like a Pegasus hub. A longer 5m cables is available if you wish to mount the SPOX remotely fromt he telescope.