Omni or Cardioid - Choose the right headset microphone
WH20 - Dynamic Headset Microphone - Shure USA
Amazon.co.jp: UHF Wireless Headset Microphone, Universal 30m/98ft Range Freehand 3.5mm Plug Wireless Headset Microphone for High Power Speaker for 100-240VPA System (#1) : Kindle Store
Audio-Technica PRO 8 HE Headset dynamic Microphone | DV247
Enya Wireless Headset Mic for NEXG 2 – ENYA MUSIC INC