This cable is designed to be used with an existing 1/8" (3.5mm) connection of a digital audio player (such as an iPodŽ) or similar device to a stereo system. It is ideal for connecting an iPodŽ, iPhoneŽ, laptop, or similar device to a hi-fi receiver using a 1/8" to 1/8" cable. Allows proper fitting when protective cases are used on mobile devices. These can also be used to hook up your digital audio player to guitar amplifiers and power amplifiers that have RCA connections and do not have the 1/8" connection.