PDP's Afterglow LVL 3 Headset for Switch leads to more voice chat confusion

Experience your favorite games without boundaries and stay connected to friends during exciting adventures with the Afterglow LVL 3 Gaming Stereo Headset for Nintendo Switch. Block out distractions with the flexible boom and noise-canceling microphone and adjust volume with the easily accessible in-line controls. Plug in your headset to your system, marvel at the crystal clear sound design brought to you through powerful 40mm Neodymium drivers, and bring the full Nintendo Switch gaming experience to life.

Designed for the Nintendo Switch system
Powerful 40mm Neodymium drivers for incredible audio
Flexible boom and noise-canceling microphone
Sleek comfortable ear cup design
Easy-to-access in-line chat volume and mute controls

Once again, we're still left scratching our heads as to how voice chat works on Switch. There's no mention here of using a phone to connect your headset. It clearly states plugging the headset into the Switch itself. Do you just use the app to hop online, and then plug in your headset to the Switch like normal? Do you plug this headset into your phone as well?