Class D Amp Module With 50W 50W Peak Power Output From Uwaykey Zk-502C Bluetooth Product Features ?CHIP?TPA3116 HIFI Chip with AM Interference Suppression Function, 50W*2 Peak Power Output ?WIDE INPUT VOLTAGE RANGE?DC 5V-24V with 5.5 * 2.1mm Interface, Laptop Power Supply Is a Good Choice ?Bluetooth AUX INPUT?User Can Directly Connect with Wireless Bluetooth 5.0, or Choose The 3.5MM Headphone (Line in) Way ?PROTECTIVE FUNCTION?Over-voltage Protection, Under-voltage Protection, Over-heat Protection, Short-circuit Protection, This means that the Bluetooth amplifier board is not easily damaged ?NOTE?Adequate Output Power Is Required When The Audio Input Is Sufficient And The Power Supply Voltage/Current Is Sufficient, The Relative Power Will Be Higher. Different Impedance Horns Will Have Different Output Power.In The Case Of Sufficient Voltage And Current, The Larger The Impedance Horn, The Smaller The Relative Sound Power, Please Pay Attention! Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!