The optical 3.5mm connector mini TOSLINK cables are made for specific devices such as iMacs, TVs and Notebooks that have a built in 3.5mm OPTICAL port. iPhones/smartphones do NOT have optical 3.5mm ports

Low-loss, low-jitter, maximum signal transfer, precision polished fiber core eliminates RF, EM, and ground loop interference. Metal connectors dampen vibration

Resist corrosion, reduce tarnish, and provide maximum protection for the fiber tip. Quality PVC jacket contributes to the OD5.0mm strain-relief construction that not only provides flexibility, but also protects the cable from kinks.