Mini Stereo 4 Channel Line Mixer Headphone Monitoring Club Live Studio Recording Product Details Warm Tips Parameters Passive mode: Active mode: Packing List MC5 PRO is a mini audio mixer with 4 groups of 3.5mm inputs, 1 group 3.5mm AUX output and 3.5mm headphone jack output, which is capable of mixing the signals from CD players, instruments, portable recording devices, video playback devices and so on. MC5 PRO supports two working modes to satisfy different requirements: 1. Active mode: need to connect independent USB power, built-in audio amp chip will work, amplify the mixed audio signal and output larger power, can connect headphones to monitor music directly via the 3.5mm headphone jack. 2. Passive mode: no power required, MC5 PRO will work in the state of pure resistance attenuation, output audio signal will be a little attenuated. And the headphone jack output will not support headphone monitoring directly but need to add a headphone amp. With one main output volume knob and four independent input volume knob, the input level of 4 groups can be controlled separately, have no interference to each other. Providing the highest sonic quality even at maximum output level. Mini size with exquisite appearance, flexible circuit both provides monitoring and mixing functions, and won?t make interference to the sound quality, compact design is very convenient to carry and use any time any where. 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.