The BY-M1 Omnidirectional Lavalier Microphone from BOYA is compatible with smartphones, DSLRs, camcorders, audio recorders Mac and Windows computers, and more. The omnidirectional pickup pattern is equipped with full, 360° coverage and the 20' cable terminates with a 3.5mm TRRS gold-plated mini-jack plug.The lavalier microphone is powered by an LR44 battery (included) and is equipped with a switch to turn the battery off or on. When using the microphone with a smartphone toggle the switch off since power is supplied by the smartphone. To operate with a camera, toggle the switch on to use the battery power. A 1/4" adapter, foam windscreen, and microphone clip are also included.