Boya's wm4 pro-k5 is an inexpensive station set for recording sound during presentations, interviews and conversations with your android smartphone. the transmitter and receiver of the wm4 pro are very compact and connect to each other on the 2.4 ghz frequency. you 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-k5 is connected directly to your smartphone. the receiver also works with most other devices with a usb-c port, such as tablets and laptops. Differences with the wm4 The wm4 pro is the successor to the wm4 and features a higher signal-to-noise ratio, so you hear less background noise. in addition, the wm4 pro is more compact than the wm4. Application wm4 pro If you are looking for a basic transmitter set for easy voice recording with your android smartphone, the wm4 pro-k5 is a good choice. optionally you can adjust the volume with the + and - button. you don't have to set anything else and you can get started right away. the included windbreak reduces wind noise. the clip attaches the microphone capsule to clothing. the range between the transmitter and receiver is up to 60 metres.