Line Mixer With Four Channels, Miniature Metal Hub Microphone, And Ultra Low Product Details Feature: The MH400 mixer provides a cost-effective solution for mixed multi-line sound signal transmission, deeply feels the value brought by MH400 Add 4 more keyboards or electro?acoustic instruments to the mix, insert the MH400 input interface, connect the MH400 output interface to the mixer input channel to solve the lack of mixer channels Despite the compact size of the mixer, the sound quality is outstanding, with an ultra-low noise operational amplifier circuit UItra-compact 4-channel line mixer to achieve the highest sound quality even at the maximum output level The ultra?compact single mixer with 4?channel input 1?channel output line, each input channel can be individually adjusted in volume 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.