With phone manufacturers trying to save space to make phones smaller, they are reducing the number of ports on a phone to just one USB C port. This means that adapters have to be purchased in order to use accessories etc. The USB Type C 3.5mm audio adapter with Power Delivery will allow you to connect 3.5mm stereo equipment to your USB type C (only) phone/tablet. The Power Delivery allows your device to be charged at a quick rate. The 3.5mm socket is used for audio output only.