Boya's BY-M1 Pro is a professional lavalier microphone, suitable for smartphones and (dslr) cameras. Thanks to the cable length of 6 meters, you have enough freedom of movement. What's special is that the BY-M1 Pro is suitable for both smartphones and cameras. A special button allows you to switch between these two modes. When you use the BY-M1 Pro with a camera, the LR44 battery does its job; it gives the microphone its power supply. A 3.5mm to 6.3mm adapter is included to connect the BY-M1 Pro to more professional cameras.