The Hosa CMP100 Series cable SUMS Stereo to Mono in one direction, or applies a Mono signal equally to the left and right in the other direction. This Hosa cable is great for sending the stereo signal from a portable CD player to a single mixer channel. For 20 Years, Hosa has provided a cost effective solution to the cabling needs of musicians, engineers, and audio and video enthusiasts the world over. In an effort to further meet those needs, Hosa continues to add new products that make the creative individual's life easier. Indeed, much of what Hosa offers is the direct result of suggestions made by customers and retailers.