Adapter cable to record sounds The Boya Universal Adapter BY-K2 3.5mm TRS to USB-C is an adapter cable to connect your microphone to a modern Android smartphone or modern PC / Mac. On one side is a 3.5 mm male jack plug (TRS) and on the other side the cable has a male USB-C connection. You use the BY-K2 in combination with an external microphone and a modern Android smartphone, PC or Mac with USB-C input. The small size makes it easy to take the adapter with you wherever you go. So you can always hold interviews or report live in unexpected situations. You can attach the adapter to an external microphone via the 3.5 mm jack plug (see optional accessories). Finally, you connect the USB-C connector to your device.