Features 4 IN 1 OUT: Stereo 4 way audio inputs are mixed into 1 way stereo output, which can directly drive headphones or connect to a power amplifier. High Current: The quiescent current is about 15mA, and the maximum driving current is 70mA, which can easily drive various audio equipment. Standard Jack: With 3.5mm headphone socket, the potentiometer controls the volume of each channel independently without affecting each other. Easy Operation: This stereo audio mixer supports plug and play, no power supply required, which is convenient and durable, with good practicality. Aluminum Shell: The audio mixer adopts sturdy aluminum alloy shell, which is corrosion resistant, has strong anti interference and lossless signal. Specification: Item Type: Audio Mixer Product Material: ABS, aluminum alloy Quiescent Current: 15mA Maximum Drive Current: 70mA Working Power: DC 5-12V Package List: 1 x Audio Mixer Package List 1 x Audio Mixer