Features: Ultra-low noise line mixer with 8 inputs and 2 outputs. Each input channel with individual volume control knobs And it has two knobs to adjust the output volume. Support MIC or LINE (4CH Stereo & 8CH Mono) input. Compact size and metal shell, portable and durable. Dual Power Supply: Power adapter (included) and 9V battery (not included). Specifications: Color: Black Material: Metal Power Adapter: US Plug Connector: 1/4" TRS Item Size: 15 * 11 * 7cm / 5.9 * 4.3 * 2.8in Item Weight: 580g / 1.3lb Note: Battery is not included. Package List: 1 * Sound Mixer 1 * Power Adapter (US)