I purchased my first set of Koss headphones in 1973--the legendary Pro 4AA; it had tight bass and got me through my college years!
With a lifetime warranty from a reputable company am going for this headset!
Who needs instructions for headphones; the previous reviewer can easily access the help section on the KOSS web site for help.
I'm giving this set 5 stars based on past experiences with Koss over the decades I've been a customer!!Buy Koss HB79 Stereophone System Wireless!