Sound from two devices into one headset

[Naipross]

My friend would need something that connects to his phone(where he is talking on discord)and connecting to his tv/ps4 into the same headset.(a something that connects his phone and ps4 to his headset)

 

[grimfox]

The item your looking for is called a mixer. For that specific application you are looking for a 2channel mixer.

an example: https://www.amazon.com/JUST-MIXER-Audio-DJ-Mixer/dp/B01LPT8KQA/ref=sr_1_1_sspa?ie=UTF8&qid=1516887859&sr=8-1-spons&keywords=2+channel+stereo+mixer&psc=1