Boya's WM4 Pro-K6 is an inexpensive station set for recording sound during presentations, interviews and conversations with your Android smartphone. The transmitters and receiver of the WM4 Pro are very compact and connect to each other on the 2.4 GHz frequency. Simply connect the receiver to your Android smartphone using the USB-c port. You do not need a cable for this, because the receiver of the BY-WM4 Pro-K6 is connected directly to your smartphone. The receiver also works with most other devices with a USB-C port, such as tablets and laptops.