The BOYA BY-MM1 is a cardioid microphone, which specially design to improve the sound quality of videos on the basis of build-in microphones. With both TRS cable and TRRS output cable included,it can be used on Smartphones, cameras, camcorders, audio recorders, PCs, and other audio/video recording devices.BY-MM1 comes out in compact size and light weight aluminium constructure , it will not be a heavy burden while shooting. Plug and play design,no need to worry the battery status. Included inside with a anti-shock mount,which can effectively reduce unwanted vibration, cable and handling noise. Also included a furry windproof shield,which specially used for minimizing the wind and environmental noise for outdoor recording , make sure the sound crystal clear.