1、The audio mixer has 8 channels of input and 2 channels of output. 2、Each input channel can be individually adjusted for volume and also supports master volume control. 3、Built-in reverb effect, and support reverb delay length control and effect mute function. 4、Support 60Hz audio cutting function and LINE / MIC input selection. 5、Compact size and metal case, lightweight and durable Features: 1. The audio mixer has 8 channels of input and 2 channels of output. 2. Each input channel can be individually adjusted for volume and also supports master volume control. 3. Built-in reverb effect, and support reverb delay length control and effect mute function. 4. Support 60Hz audio cutting function and LINE / MIC input selection. 5. Compact size and metal case, lightweight and durable   Specification: Condition: 100% Brand new Item Type: Audio Mixer Color: Black Material: Metal Power: 9V battery (not included) or DC 12V power adapter Input: 6.35mm Interface Output: 6.35mm Interface Size: Approx. 15 x 10 x 6cm / 5.9 x 3.9 x 2.4in Weight: Approx. 846 g / 29.8oz Style: EU Plug 110-240V(please kindly make a note if you need any plug adapter)   Package List: 1 x Mixer 1 x Power Adapter 1 x Audio Cable 1 x User Manual (Chinese and English)   Note: 1. The battery is not included. 2. You need to open the bottom cover with screws to install the battery