Features: Can be widely used for lectures, interview, stage performance, self-media recording and public speaking environments and more general speech pickup, any condition that demands a high quality microphone. Compatible with many devices using 1/8(3.5mm) TRRS connector like mobile phone or tablet. It has high signal noise ratio, wide dynamic range, and flat frequency response. Provide clean, bright, yet natural reproduction professional-grade audio in almost any scenario, bring broadcast quality sound into your life. With built-in lithium battery and well-designed circuits, Aputure A.lav aims to provide a precise and stable reference power, of which a qualified voice recording is assured. This hence consists of base of good user experience. Different from other usual microphone, window-penetrating multi-functional indicator of A.lav keeps you informed of power status. Under normal working state, green light is on; under charging status, red light is on