Model : boya by-mm1 the boya by-mm1 is a cardioid microphone, which specially design to improve the sound quality of videos on the basis of build-in microphones. with both trs cable and trrs output cable included, it can be used on smartphones, cameras, camcorders, audio recorders, pcs, and other audio/video recording devices. specifications: transducer: electret condenser polar pattern: cardioid frequency response: 35-18khz +/-3db sensitivity: -42db +/- 1db / 0db=1v/pa,1khz signal to noise ratio: 76db spl plug: 3.5mm trs and trrs connection dimensions: φ22*81mm net weight: 86g.We do delivery.