The Sony ECM-44B Lavalier Microphone makes the exceptional quality of Sony's electret condenser microphones available for budget-conscious productions, and a variety of sound-reinforcement requirements, such as lectures and demonstrations. Measuring only 8.5 x 14.5mm, the ECM-44B reduces visual distraction for the audience. The ECM-44B can be depended upon for clean, bright, yet natural reproduction. This microphone operates on a single AA battery (does not need phantom power) for over 5000 hours of service.

When new, these microphones sell for $169 each. You can have both for $150!