Cooidea 3 Channel Stereo Audio Mixer, AUX Interface Support 3 In 1 Out Mini Sound Mixer with Touch ON/OFF Switch and Volume Output Adjustment - For PC, Phone, Laptop, Headphones

I needed to take two audio sources (game console output and a feed from a different tv, both 3.5mm connections) and mix them into one output for a headphone transmitter and this did the trick perfectly.The only slight downside is that you cant control the input levels, just the master output (changing the headphone out volume on the tv fixed it, along with changing the in game console output).It’s tiny as stated, and the touch screen volume control works great.I did experience some ground loop hum, but this was because i was powering the headphone transmitter and the mixer from the same 5 way usb block. Plugging the transmitter into a different source completely eliminated it.For £22, i happy with it