•BOYA BY-BM3051S is a professional-grade stereo,loud channel condenser microphone for DSLR cameras,camcorders,recorders,and other devices •The frequency response of 20Hz-20khz spreads broadcast-grade sound quality,suitable for photography crowds,anchors,bloggers,and other people •Mono/stereo switch to different pickup modes to achieve the ideal radio effect •The microphone has a three-stage gain function (-10,0,+20dB),+20dB gain can maximize the microphone's radio effect •-10db attenuation to avoid sound distortion in the noisy recording environment. Low-cut function (flat cut/75Hz) can filter low-frequency noise and other battery-powered,up to 30 hours of battery life) •3.5mm headphone monitoring hole and vibration reduction device to help users monitor the recording effect and reduce background noise generation Specifications: •Material: ABS •Acoustic principle: capacitive •Pickup mode: super-cardioid/stereo •Frequency response: 20-20000Hz •Sensitivity: -30±3dB(0dB=1V/Pa@1kHz) •Output impedance: 50Ω •Signal-to-noise ratio: 82dB •Gain: -10dB,0dB,+20dB •Low cut: 0Hz,75Hz •Output hole: 3.5mm TRS audio output •Power: 2 x AA batteries (not included) •Endurance: 30 hours •Other features: automatic power on/off function •Size: 184 x 65 x 122mm •Weight: 170g Package included: •1 x Microphone •1 x Windproof Foam •1 x Fur Windshield •1 x Carry Pouch •1 x English Manual •1 x Warranty Card •Other items not included