High-quality condenser microphone, ideal for video use, vlogging, YouTube, Interview, Studio, Video Recording Power Pack: provides power for the microphone for use with cameras and other devices requiring a powered mic . Camera Setting: turns the power on to the microphone. For use with cameras and other devices requiring a powered mic Smartphone Setting: switch to smartphone mode to allow the BY-M1 PRO works on mobile devices like smartphones, tablets and PC etc that with a 3 . 5mm input jack 3.5mm Connector: connects the microphone to the smartphone, camera, camcorder, or other recording device. 0 / -10dB Setting: switch to 0 /-10 dB according to the recording environment. with -10dB pad switch, it effectively reduce unwanted plosive when the subject sound is very loud and close to the microphone Headphone Monitoring: in smartphone mode