BOYS BY-BM3037 On-Camera Shotgun Microphone Instruction Manual Thanks for choosing BOYS! The BOYS BY-BM3031 is a Super-cardio id condenser shotgun microphone that delivers high-quality sound for SLR, camcorders, audio recorders and more, It features a three-level gain switch that provides a +20 dB boost, 0 dB unity gain, or -10 dB pad to prevent distortion from audio overload, And also features a switchable high-pass filter roll off unwanted low-frequency noise and rumble, The lightweight mic attaches easil