Mad Catz F.R.E.Q. M Wired Headset - Gloss Black. Now the same headset can go wherever you go. The F.R.E.Q. M Mobile Stereo Headset is the ultimate rich-stereo headset sporting a lightweight foldable aluminum chassis for easy transport. With two unique in-line cables this all-in-one headset can be used with a PC Mac or smart devices.