Feature: 1. The MH400 mixer provides a cost-effective solution for mixed multi-line sound signal transmission, and deeply feels the value brought by MH400 2. Add 4 more keyboards or electro‑acoustic instruments to the mix, insert the MH400 input interface, and connect the MH400 output interface to the mixer input channel to solve the lack of mixer channels 3. Despite the compact size of the mixer, the sound quality is outstanding, with an ultra-low noise operational amplifier circuit 4. UItra-compact 4-channel line mixer to achieve the highest sound quality even at the maximum output level 5. The ultra‑compact single mixer with 4‑channel input and 1‑channel output line, each input channel can be individually adjusted in volume Specification: Item Type: 4-Channel Line Mixer Material: Metal Colour: Black Product Size: Approx. 10.5 x 5.7 x 3.2cm / 4.1 x 2.2 x 1.2in Line Input: Impedance: 4.7 KΩ Maximum Input Level: +16 dBu Line Output: Impedance: 80Ω Maximum Output Volume: +16 dBu. Package List: 1 x Sound Mixer1 x Power Adaptor1 x User Manual Note: Precautions:1. Do not use this equipment near water.2. Only clean with dry bottom.3. Do not block any ventilation holes. Install in accordance with the manufacturer's instructions.4. Do not install near any heat sources, such as radiators, heat regulators, furnace or other equipment (including amplifiers).