After the microphone and music are amplified, they can be output independently or mixed output. There are three output ports in , and the mixed output port can directly drive headphones to listen.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.The 6.5 port of the dynamic microphone is amplified by 75 , the 3.5 port condenser microphone is amplified by 22 , and the stereo music input 3.5 port port is amplified by 5 .The power supply is DC 5-12V, and the new rail-to-rail operational amplifier MC33202 is used.Please use a high- low-ripple power supply, as the power supply is not good enough to easily . The power interface is DC5.5*2.1, inside + outside - not include the power supply .Material: Metalcolour: blackPackage Contents:1 x MA-2S Audio PreamplifierOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.