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 there is a 3.5mm male jackplug (trs) and on the other side the cable has a male usb-c connection. Usage boya universal adapter by-k2 3.5mm trs to usb-c You use the by-k2 in combination with an external microphone and a modern android smartphone, pc or mac with usb-c input. because of its small size, you can easily take the adapter with you wherever you go. so you can always conduct interviews or report live, even in unexpected situations. the 3.5 mm jackplug allows you to attach the adapter to an external microphone (see optional accessories). you then connect the usb-c connector to your device.