This one was the ultimate mono-HS design in its time. Unfortunately I believe it came out too late – the market had already progressed past mono, and all the focus was on the stereo (with a connecting cable at the time behind the neck). This one while being small, also unfortunately has slightly too large ear interface (too long). The strength of the deisgn of the product lied in its unique shape tailored to the right ear and they way it integrated into the charge box cradle. Google it if you want to know what that looked like.