The BOYA BY-M1 Lavalier Microphone is a quality lavalier with an omni-directional polar pattern and condenser element, well suited for general speech vocal works, sports, presentations, instruction, interviews, etc. For Smartphone, please switch off the microphone and slide the ON/OFF up to OFF, while slide to ON for DSLR, Camcorders, Audio recorders and so on. The Boya BY-M1 Lavalier Microphone is a quality lavalier with an omni-directional polar pattern and condenser element, well suited for general speech vocal works, sports, presentations, instruction, interviews, etc. For Smartphone, please switch off the microphone and slide the ON/OFF up to OFF, while slide to ON for DSLR, Camcorders, Audio recorders and so on.