The by-dm1 from boya is a lavalier microphone, which you can connect directly to the lightning port of your iphone or ipad. a reliable solution to record voice in high quality. the by-dm1 is part of apple's made for iphone program (mfi), so you can count on a high-quality product. the storage bag offers secure protection and has pockets for additional accessories. Usage by-dm1 You can use the by-dm1 with all apps that normally use the internal microphone of your iphone or ipad. for example the standard camera app or dictaphone app. the camera of the iphone is so good nowadays that, in good light, it can be used for tv interviews. with the by-dm1 you can also bring the sound to a professional level. the cable has a length of 6 meters, which means that the by-dm1 can also be used for presentations, for example. a small wind filter is included, which makes good recordings possible outside. the supplied clip ensures that you can attach the by-dm1 to almost any clothing. Technical specifications by-dm1 - lavalier microphone - freqence range: 50 to 20,000hz - output impedance: 2.2kω - sensitivity: -30db +/- 3db / 0db = 1v / pa, 1khz - signal / noise ratio: 58db or more - weight: 58 grams