Sennheiser HSP Essential Omni - - The industry standard for productions both large and small – the HSP Essential Omni guarantees a brilliant sound that meets high expectations, has a highly durable
Omni-directional Headworn/Headset Microphone, for Sennheiser HSP 2-EW-3 SK 1093 | eBay
Sennheiser HSP Essential Omni with LEMO 3 Connector- Beige | Sweetwater
Sennheiser HSP 2 - Headset condenser microphone black - Avacab