Amazon.com: Sennheiser HSP 4-EW-3 MKE platinum condenser capsule with a cardioid microphone : Musical Instruments
Sennheiser HSP 4 EW-3 Beige
HSP4 New Cardioid Headset Headmic Microphone for Sennheiser Shure Audio Technica | eBay
Amazon.com: Sennheiser MKE Platinum Cable for HSP 2 and HSP 4 Head-worn Microphone with Stipped and Tinned Leads (No Connector), Black : Musical Instruments