Sound test: Boya BY-V20 dual wireless mics with USB Type C receiver.
Conclusion: Quality is really good. Compared to Rod's GO II which cost around 60K plus, these cost around 9K and well worth their price. Highly recommended to video makers who record regularly on their mobiles.
Limitation: Will work only with mobile phones with USB-C port. An Apple lighting port version is also available for same price.