The Damgoo Audio Amplifier Board Has A 10W 15W 20W 2.0 Dual Channel Stereo Product Details ???I Am small, But I Have High Compatibility? The DC power supply commonly used for wide voltage input (DC8-24V) can provide energy for me, and at the same time, I can connect 2-8? speakers; ???I Am Small, But My Power Is Not Small"?I can provide a maximum power output of 20W * 2, if you use more than 20w * 2, it is recommended to add a heat sink on the back of this board; ???I Am Small, But I Have Many Functions?With the latest BT 5.0 connection protocol, the power consumption is smaller and the transmission distance is farther. The same multi-function button can easily realize the volume + volume-, play / pause function; ???I Am Small, But I Am Not Vulnerable? I have three protection mechanisms, reverse connection protection, short circuit protection, and overheat protection, which means I am not easy to damage. ???7 * 24 hours after-sales service? Paying attention to customer experience and satisfying customers is our service tenet. If you have any questions about the product, or the product has quality problems, please contact us at any time, we will give you a satisfactory answer. 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.