Dynamic mic booster adds extra gain to your sound High-quality preamp provides up to +25 dB of gain Phantom powered with no need for external power supply Works with almost any dynamic or passive ribbon microphone Rugged, road-worthy construction for years of dependable use ...Dynamic mic booster adds extra gain to your sound High-quality preamp provides up to +25 dB of gain Phantom powered with no need for external power supply Works with almost any dynamic or passive ribbon microphone Rugged, road-worthy construction for years of dependable use Whenever you need more headroom for any microphone in your podcast, recording studio or stage setup, the MIC BOOSTER CM-1 is exactly the tool you need to get a crisp and clean microphone signal in a robust and simple to use package.