The K6 Microphone System Powering Module by Sennheiser is the compatible base for many modular capsules. It features high output levels with low noise, a switchable bass roll-off, and transformerless balanced output.
The K6 can operate on a single AA battery (not included) or Phantom power. Its on/off switch also has a battery test position, so you can be sure you have enough juice. The K6's anodized matte black finish will resist abrasions to maintain a professional appearance, even under rigorous usage.