BY-M1 Lavalier-SLR Camera Recorder Omni-directional Condenser Microphone BY-M1 Product Parameters Model: BY-M1 Condenser Microphone Sensitivity: -30dB 3dB (0dB = 1V / pa, 1kHz) Frequency response: 65Hz-18kHz Signal to noise ratio: & gt; 74dB Power supply: button battery Product weight: 20.5g Product interface: standard 3.5MM Overview: BOYA BY series -M1 for DSLR cameras - wireless lavalier microphone, interview microphone, bee omni-directional lavalier condenser microphone, suitable for iPhone, SLR, video camera, recorder, computer etc; omni-directional sound reception mode, 360 degree range, 3.5mm plug integrated with 6m cable, when using the phone for recording, before inserting the microphone into the phone, set the switch to the file from the smartphone, otherwise recording will not be possible when using SLR cameras, the switch can only be used to modulate camera recording.