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. The difference with the by-m1 The pro version has a 3.5 mm output, so you can listen to the sound live with earplugs. in addition, it has a special button that allows you to turn on an attenuation of -10 db. this is useful when the sound is very loud. the cable length has also been extended; 6 metres compared to 4 metres. Usage by-m1 pro By-m1 pro lets you interview someone and record the sound. thanks to its universal applicability and affordable price, the by-m1 pro offers a solution for the beginner and advanced filmmaker. a tie pin and windscreen are included for the microphone. you will also receive a handy storage bag.