4 IN 1 OUT FUNCTION USE: If you need a mini audio mixer with 4 channels of audio (wired or wireless dynamic microphones, electronic musical instruments, CDs, computers, game consoles, etc.) integrated into one channel output, this stereo line mixer is perfect for you. The stereo audio mixer can also be used as an extension when there are not enough channels to use | LOW-NOISE: LZSIG mini audio mixer has been upgraded to use a 12V adapter for the power supply, Add a MPS power management chip to fix the issue of grounding noise. Equipped with 6 ROHM low-noise and high-quality operational amplifiers, it guarantees the highest sound quality, ultra-low noise, and distortion-free performance | STEREO/MONO MODE: The stereo(S)/mono(M) mode of our stereo line mixer allows for easy switching between input sources. Compatible with both 3.5MM 1/8" and 6.35MM 1/4" plug or device, there is no need for converter adapters | DYNAMIC MICROPHONE MODE: Different from other audio line mixer, our audio mixer is equipped with an individual microphone input to collect your voice through a dynamic microphone in mic mode, and integrate with other input sound sources into one channel output | AFTER-SALE SERVICE GUARANTEE: Buy our 4 channel mixer enjoy a worry-free shopping experience with our after-sale service guarantee. Our 24-hour customer service is always available to help you with any questions or concerns you may have, and we will provide you with a satisfactory solution | Note: If you encounter any issues with the included adapter, please don't hesitate to contact us. We are here to assist you and ensure your experience is smooth and hassle-free.