With the Boya Duo Lavalier Microphone BY-M1DM you can record 2 people at once. You use this for example during an interview or interview. The sound is recorded in two separate tracks. This way you can mount and adjust the recordings separately. You connect the microphone to your smartphone, camcorder, SLR and system camera. This makes the microphone suitable for both novice and advanced videographers. With a toggle button you switch between camera and smartphone mode. That way you use the microphone in multiple situations. You have a lot of freedom of movement thanks to the 4 meter long cable. With the supplied wind screen you will not get any noise in your recordings when you film outside.