The ETM-001 is a 3-pole mic originally designed for PCs and digital voice recorders.
BUT…it’s secret power is that it’s an awesome GoPro Hero2, Hero 3/3+ or Hero 4 microphone! If you own a GoPro Hero camera, you need an ETM-001.
PLEASE NOTE: For the GoPro Hero3/3+ and Hero4 you will need the Mini USB to 3.5mm Microphone Adapter Cable for GoPro or the 3.5mm Mic Adapter from GoPro