Feature: 1. [EASY ADJUSTMENT] PT2399 + NE5532 continuously adjustable reverb and volume, with high performance and low noise. 2. [APPLICABLE DEVICE] Support mobile coils and computer electret microphones and most wireless microphones. 3. [EXCELLENT PCB] Using 1.6mm thick double sided PCB, spray tin process, ensure the good passage of large and small currents. 4. [WIDE VOLTAGE RANGE] With DC12‑24V wide voltage range, suitable for more audio equipment, has strong practicability. 5. [OUTPUT INTERFACE] With 2 microphone outputs, mixed output and music signal output, with less interference. Specification: Item Type: Digital Microphone Material: PCB Voltage: DC12-24V Package List: 1 x Microphone Module Note: Do not overload to use.