Ugreen AV141 headset splitter, 3.5 mm to 2 × 3.5 mm, dark grey

The Ugreen AV141 plugs into a laptop's combined 3.5 mm socket and gives you two separate sockets, one for headphones or speakers and one for a microphone. They are marked with headphone and microphone icons, so they are hard to mix up. The splitter is 20 cm long.