After the microphone and music signals are amplified, they can be output independently or as a mixed signal. There are three output ports in total; the mixed output port can directly drive headphones. The 3.5mm input interface with bias voltage supports electret and standard condenser microphones. The 6.35mm (1/4 inch) input interface is designed for dynamic microphones and supports both wired and wireless microphones. The dynamic microphone input (6.35mm) provides 75x amplification. The condenser microphone input (3.5mm) provides 22x amplification. The stereo music input (3.5mm) provides 5x amplification. Power supply: DC 5–12V. Uses rail-to-rail operational amplifier MC33202. Use a high-quality, low-ripple power supply. Poor power quality may cause noise. Power connector: DC 5.5×2.1mm (center positive, outer negative). Power supply not included. Material: Metal Color: Black Package Contents: 1 × MA-2S Audio Preamplifier Note: Other accessories are not included. Note: Due to lighting conditions and display differences, the actual product color may vary slightly from images. Measurement tolerance: ±1–3 cm.