This is a professional and portable audio mixer. Made of iron and ABS materials, it is safe for long time to use. The audio mixer can help collect sound from different sources into a monitoring position for monitoring or routing, can work without battery or external power, very convenient to carry and use anytime and any places you want. Features - Color: black. - Material: iron, ABS, electronic components. - Size: 8.50X5.80X4.50cm/3.34X2.28X1.77in - Power: Max 5W. - This mixer can work without battery or external power, very convenient to carry to any places you want. - Proper for where multiple channels need to be mixed into one audio track, professional and practical. - Made of iron and ABS materials, it is safe and durable for long time to use, will not easy to get deform or damaged. - Suitable for mixing the from CD players, instruments, portable recording devices, and more. - 4 channels input have no to each other, you can have satisfying using feeling. Package list: 1 x audio mixer 1 x manual