Used Lectrosonics M152/WP Omnidirectional Lavalier Microphone with Watertight Connection, 20 - 20000Hz Frequency Range, 3k (2-6k) Impedance

The Lectrosonics M152/WP Omnidirectional Lavalier Mic with Watertight Connection is a high performance microphone with heavily suppressed mechanical noise for critical applications. A wide, flat frequency response is augmented by a 2 or 3 dB bump in the upper octaves to add a crisper sound. The mic capsule should be positioned in the center of the talker's chest, not to either side, as high up as is practical. In windy conditions, it can be placed underneath a collar or thin clothing to reduce wind noise, although this will dull the sound somewhat.