Lzsig Mini Audio Mixer, Stereo Line Mixer For Sub-Mixing, Ultra Low-Noise, Product Details [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 digital audio mixer has been upgraded to use a 12V adapter for the power supply, which effectively reduces the noise caused by the USB power supply. Equipped with 5 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)/mono9(M) mode of our line mixer allows for easy switching between input sources. Compatible with both 3.5MM and 6.35MM headphones, there is no need for converter adapters. [DYNAMIC MICROPHONE MODE] --- Different from other mixers, 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] --- 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. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.