The Comica VM20 Shotgun Video Microphone is a multi-functional super cardioid condenser microphone that is compatible with a wide range of devices. It features adjustable stepless gain control, two low-cut filter modes, and a long battery life of up to 60 hours. The microphone can be used with DSLR cameras and smartphones, and it provides professional sound quality with minimal environmental noise. It also has an OLED power display for monitoring battery life. Additionally, the microphone can be used as a boom mic with an extension cable. It does not automatically turn off with the device, and can be used as a USB mic with the appropriate adapter cables for different devices.