Universal compatibility with dynamic microphones and electret microphones for broad use Power input supports both AC and DC operation; DC input can be divided into positive and negative rails for a symmetric supply and convenient integration with different power sources Latest upgrade features LM317 low ripple voltage regulator circuit design and a preamplifier built around the OP275 op amp for improved fidelity Clear benefits Enables reliable mic preamplification across common microphone types Reduces noise and ripple for cleaner microphone signals Flexible power options simplify setup in various environments 23 use scenarios Home studio or podcast setup using dynamic or electret microphones to deliver clean, balanced audio to a recording interface Small venue or live sound applications where stable power and low noise contribute to clear voice reproduction Video production or field interviews where different power sources are used and consistent microphone performance is required Important notes Size and material specifications are not provided This description reflects the product features as specified: universal microphone compatibility, AC/DC power input with positive/negative rail option, LM317 regulator, and OP275 preamplifier