1、3 Output Ports: After the microphone and music are amplified, they can be output independently or mixed output. There are three output ports in total, and the mixed output port can directly drive headphones to listen. 2、3.5mm, 6.5mm Interface: The 3.5mm interface with bias can be used with electrets and common condenser microphones, and the 6.5mm interface is a dynamic microphone, which can amplify wired and wireless microphones. 3、Amplification Times: The 6.5mm port of the dynamic microphone is amplified by 75 times, the 3.5mm port condenser microphone is amplified by 22 times, and the stereo music input 3.5mm port is amplified by 5 times. 4、Ultra Low Noise: Adopts a full aluminum alloy shell that can completely isolate electrical interference. Adopts rail to rail op amp MC33202 to ensure the highest sound quality at all output levels, operates with ultra low noise, and delivers excellent sound performance. It is ideal for desktop sound systems. With premium low ripple power supply, it is not easy to produce AC sound. 5、Widely Applicable: With two volume control knobs, it mixes multiple channels into a single track, compatible with a wide range of devices for musical instruments, microphones, cell phones, computers, amplifier equipment, speakers, small stage setups, drum kits or submixes and other sound equipment. Item Type: Stereo Sound Preamplifier Material: Aluminum Alloy Color: Black Power Connector: DC 5.5x2.1MM Input Voltage: DC 5-12V 1 x Stereo Sound Preamplifier 1 x Sound Cable 1 x Adapter