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It can directly drive the headphones or connect the amplifier, the interface is 3.5mm stereo socket. The Working Power Supply DC 5V-12V DC5.5 x 2.1, and the magnification is about 2 times. Each potentiometer individually controls the volume of each channel, and the volume does not affect each other. This is a stereo audio mixing board with four audio inputs mixed into one stereo output. (Four Input.One Output). The quiescent current is about 8ma, and the NJM3414 low-voltage and high-current operational amplifier is used. The maximum driving current is 70ma, which easily drives various earphones and external amplifiers.