BESTEAM Professional Mini USB External Microphone with Collar Clip for GoPro Hero 3 3+/4 Mini USB Microphone professional design for Gopro hero3/3+/4 camera. You can plug-in hero camera directly, no need 3.5mm adaptor. it help you get stoere music or vioce when use The frame/Protective case Cable length = 1200mm (47.2") Current Consumption: &lt; 0.5A Signal to Noise Ratio: &gt; 58dB Directivity: Omnidirectional