Uwaykey Class D Amp Module For Diy Wireless Speaker Mini Bluetooth Amplifier Product Details ?Output Power of ZK-502L?This little thing smaller than a card can output up to 50w*2 power (peak power). Wide voltage input: DC 5-24V, common power adapter can supply power for it. It is recommended to use a DC power supply between 12-20V. ?Bluetooth 5.0?User Can Directly Connect with Wireless Bluetooth 5.0 without Password ?Easy Installation and Short Start-up Sound?The Illustration Of Each Interface Is Printed On The Protective Plate, Making It Easy To Install Even Without Instructions. The Sound of The Amp Board To Start And Connect To Bluetooth Is Short . ?PROTECTIVE FUNCTION?Over Protective Function:This BT Amp Is Designed with Protective Case, Over-heat Protection, Short-circuit Protection ?BUY WITH EASE?We are committed to quality and customer service. 24/7, if you need any help. We will provide you with a 100% 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.