Mini Audio Mixer, 4 Channel Line Mixer With 3.5Mm Stereo Jack, 4 Input 1 Stereo Product Details ?STEREO 4 IN 1 OUT?This portable audio mixer mixes four sound inputs into one stereo output. Each potentiometer controls the volume of each channel independently, and the volume does not affect each other. Easy to carry and operate. ?EASY TO ADJUST?This stereo line mixer splitter has standard switch gear. With bass and treble controls, you can adjust settings to your needs and easily drive a variety of headphones and external amplifiers, can be output by headphones and speakers. ?WIDE COMPATIBILITY?This headphone mixer with 3.5mm stereo jack, can directly drive headphones or connect power amplifier. The input interface is compatible with PC, mobile phone, laptop, etc. Output interface is compatible with speakers, headphones, bar speaker, etc. ? TO USE?The working power of the sound mixer board is DC 5V?12V DC5.5 x 2.1, and the magnification is about 2 times. The quiescent current is about 8mA. Using NJM3414 low voltage and high current, the maximum driving current is 70mA. ?100% QUALITY ASSURANCE?We are very confident in the quality of this audio mixing console, and provide warranty or refund for it. Please feel to reach us if you have any questions about your purchase. We will solve your problem within 24 hours. 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.