The BY-M1DM from Boya is a double lavalier microphone, which is suitable for smartphones and (DSLR) cameras. The cable length of 4 meters offers you enough freedom of movement. The special feature is that the BY-M1DM is suitable for both smartphones and cameras. With a special button you can switch between the two modes. When you use the BY-M1DM with a camera, the microphone is powered by the LR44 battery. A 3.5mm to 6.3mm adapter is also included to allow you to connect the BY-M1DM to more professional cameras. With the BY-M1DM you can interview two people at the same time and record the sound. The audio from both microphones is recorded together on both tracks (stereo).