Here's what Sennheiser say about the MKE2:
High-quality, sub-miniature omni-directional clip-on lavalier microphone. For all areas of live work. Fulfills highest demands on sound quality and ruggedness. Sweat protected by special ultralight Umbrella Diaphragm.
- New Umbrella Diaphragm™ protects the mic against sweat
- Very high sound pressure handling capability
- Versatile attachment due to an extensive range of accessories
- Cable length: 1.6m
- Pick-up pattern: omni-directional
- Equivalent noise level: 26 dB