The MI121 is a high-quality, extra long 4.5 meter USB 2.0 cable, designed and built specifically for use with PicoScope oscilloscopes, and featuring 20-AWG conductors for minimal resistance. This also reduces the chance of voltage drop caused by inferior USB ports on some PCs and laptops. As well as reducing voltage drop, it prevents noise that could be caused by an unreliable ground connection and poor screening in inferior cables