The adaptor takes care of needing MHL support on the TV by converting to HDMI output. The phone obviously needs it and as @Choke said most newer TVs have MHL support anyway. My 2014 Sony and 2016 Panasonic both have it. If the adaptor has a USB connector, plug it into a USB slot on the TV if it has one to charge the phone while connected to the TV so the battery doesn't run out.