This Bluetooth module D10 allows you to repair or convert any speaker box into a fully functional Bluetooth, radio, or karaoke receiver with no soldering. This version is 100w there is another version D50 that's rated to 300w for roughly the same price. I decided to provide a review because most of the videos on here were foreign and I could not understand them. Hoping this better informs you before you purchase, if you have any questions feel free to reach out.
MODEL D10 -
www.ebay.com/itm/115807849982?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=P9MjnnmxQha&sssrc=4429486&ssuid=lyfmqfehskm&var=&widget_ver=artemis&media=COPY
Model D50 -
www.ebay.com/itm/386451181742?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=LsA7TcMiS22&sssrc=4429486&ssuid=lyfmqfehskm&var=&widget_ver=artemis&media=COPY