Built-in professional high-performance cardioid pickup microphone, using dual-head complementary acoustic interference pickup technology, with long pickup distance, wide frequency response, and high-definition sound resolution, with an effective pickup distance of up to 20 meters Adopting NCR noise reduction pickup technology, super noise suppression characteristics External and10db sensitivity enhancement switch to adapt to different sound intensity pickups With low battery indicator function, keep track of battery usage at any time Special shock-absorbing structure effectively reduces camera mechanical noise and other vibration noise interference Using standard universal connector specifications, it can be easily installed and fixed on the camera The sound collecting tube is designed with alloy material, which is strong and reliable and can effectively shield electromagnetic interference Specification: Monomer: Back electret Directivity: Supercardioid Sensitivity enhancement: and10dB±2dB Frequency response: 50Hz-16kHz Output impedance: 2000±30 percent (at1kHz) Sensitivity: -37dB±3dB(OdB-1V or Pa at 1kHz) Power supply: 200mAh 3.7V battery