Features Good audio amplification: the amplifier can amplify the dynamic microphone with 6.5 port by 75x, the 3.5 port condenser microphone by 22 times, and the stereo music input with 3.5 port by 5 times. Many compatible devices: the 3.5mm interface of the amplifier can be used with electret and ordinary condenser microphones, and the 6.5mm interface is a dynamic microphone that can amplify wired and wireless microphones. Anti Interference The amplifier is a stereo switch box, the signal is lossless and the sturdy aluminum housing has strong anti-interference. 3 output ports: after the microphone and music have been amplified, they can be output separately or mixed. There are a total of three output ports, and the mixed output port can directly control the headphones for listening. Small size: the amplifier is small, easy to carry and can be used for audio amplification anytime and anywhere without compromising sound quality. Specification: Item Type:Small Stereo Audio Preamp Material: ABS and aluminium. Dynamic microphone: 6.5 mm. Condenser microphone interface: 3.5mm Power supply: DC12V. Power connection: DC approx. 5.5 x 2.1 mm / 0.2 x 0.1 inches. Package list: 1 x Small Stereo Audio Preamp 2 x audio cable. Small note: Please use a high quality power supply with low ripple as the power supply is not good enough to cause a hum Package List 1 x Small Stereo Audio Preamplifier 2 x Audio Cable