Digitek DM 201 Unidirectional Interview Microphone for Smartphone & DSLR Camera idle range compatibility with Smartphone / Camcorder / Digital DSLR Camera with 3.5mm Microphone input Socket & Hotshoe. A Slim body Wirless Interview Microphone Allows for extensive application in meeting, interview, recording and so on, very practical. With Anti-Wind Foam to Eliminate Noise Sensitivity : Short Range -45db Long Range -38db Power Supply : DC1.5V (1 AA Battery, not include)