Simply superb audio mixer Features: Audio mixer with 8 channels input and 2 channels output. Each input channel can be adjusted volume individually. With 2 master volume knobs for controlling the output volume. Support MIC or LINE(4ch stereo & 8ch mono) input by adjusting switches. Compact size and metal shell, lightweight and durable. Dual power supply: power adapter(Included) and 9V battery(Not included). Specifications: Brand: ammoon Model: AM-228 Color: Black Material: Metal Power Adapter: US Plug Input: 6.35mm Interface Output: 6.35mm Interface Item Size: 15 * 10 * 6cm / 5.9 * 3.9 * 2.4in Item Weight: 705g / 1.6lb Note: The battery is not included. You need to open the bottom cover with a screw to install battery. Package List: 1 * Mixer 1 * Power Adapter(US) 1 * Cable