Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control for DIY Bluetooth Audio and Store Home Theater

When I receive mine, I open the plastic bag and found that the heat sink had come off and was stuck to the capacitors. The screw that holds it was at the bottom of the bag. Every screw in this item was loose, I removed the cover and cleaned all the thermal paste off, applied new thermal paste and reattached heat sink properly, I’m glad I noticed it before I plugged it in, overall this is a pretty good little amplifier, and it works as described, just inspect everything before you use it, I’ve used it with several different sets of speakers and subwoofers and it seems to work pretty well Although there seems to be an issue with lack of mid range, could be all the speakers I’ve tried, the app itself is useful to name the device and put a password on the Bluetooth, but other than that, I deleted it, The app made connecting with Bluetooth more difficult but I would buy this product again.