Genuine Astro A40 1.0M AUDIO CABLE This 1.0m Audio Cable is included in all A40 + M80 bundles, and is meant as a replacement cable. It can work with all Gen 1 and Gen 2 A40 headsets and provides audio and voice communication when used with a MixAmp Pro. The grey 3.5mm end of the cable connects to your headset, while the 3.5mm black end connects to the audio source or MixAmp Pro.