This product is a portable audio mixer. It is made of solid materials. It is safe and durable. It can serve you for a long time without being easily damaged. It is an excellent portable audio mixer that can bring you convenience, allowing you to have comfortable experience. Features -Color: Black -Material: PCB, acrylic, copper, electronic components -Size: 8.35X5.40X2.10cm/3.28X2.12X0.83in Voice data: 24dBi - Small and delicate passive circuit design will not increase or reduce the audio . - Work without battery or external power supply, easy to carry and use anytime, anywhere. - Single main output volume knob and 4 independent input volume knobs, the 4 inputs do not with each other. - Provides the highest sound even at the maximum output level. - workmanship, reasonable structure, and practical, can bring you convenience. Package list: 1 x audio mixer