ZK-502A Bluetooth 5.0 Amplifier Board 50W*50W with A 12V2A DC Power Supply,100W Bluetooth Audio AMP Board for DIY Bluetooth Speaker Kit DC9-24V,Black

Have purchased 8 units so far and everyone has been perfect shipped fast and workingFor what I am making for my "side hustle" it is perfect! Even hooked to high quality speakers and it has sounded really well ...Bluetooth quick pairing every time and tested app works perfect for USB playHooked em up for Christmas presents and preloaded music so entire family has it and with easy wiring for speakers just flawless so farCan't articulate enough how much this has helped me in my project just didn't want to buy bt board powerboard speaker etc ....just not confident in sodering things like that and with it built in on this model it's plug and playWill move the 6 units and reorder have another 20 radios to convert!

I had a set of computer speakers that were the worst case of Chinese poor QC that I've ever seen. The boxes were good, the drivers were OK, the electronics were crap. They were Genius brand and hand-soldered very badly, so the amp board melted down. I replaced it with this cute little board, about the same power, more capabilities (bluetooth, USB). Took some tinkering to make it fit but now they work! It's more than adequate to fill the small room with sound and the sound quality is quite good--and it's inexpensive.

Works really well. Not hard to set up. I paired it with 2, 30 Amp speakers and they sound really loud!

Bought for Xmas gift. Worked fine for 5 months. The included cheap power supply burnt out the board

The amps nice and does the job. But the app doesn’t save custom EQ settings so you have to reset it each time. If I did it again I’d buy the one with the treble and bass knob on the amp. I power it with a 20v drill battery and it does nicely,

I really like the instructions that came with the product. It was very easy to setup.

I have purchased literally hundreds of these units. I recently noticed this unit which comes with an AC adapter.Everything works well, but the adapter will leave you wanting more.The picture I have attached shows the output at 12v and 2 amps. This is a 100 watt (max) unit. If I ran it with this adapter, I would only be getting 24 watts instead of 100. (Volts x amps = watts)So at 12 volts, I would want the amps to be around 8. That gives me 96 watts which is far closer to what the factory intended.My advice is to skip the version with the adapter until they upgrade it for better performance.

Been using a Chromecast Audio with a Fosi mini amp wired to small but mighty 6.5" 2-way outdoor speakers outside on the deck. The Chromecast Audio is having issues so I started seeking out a Bluetooth 5 receiver to use in its place. Came across this amp with Bluetooth 5 built in, and I bought it knowing I'd be able eliminate a power cord for the external device (Chromecast or Bluetooth receiver) and the dangling audio connectors too. I'm using a old laptop PS that's 3.4A/19V, and it's more than enough clean headroom for my needs. I'd say the sound is on-par with the Fosi amp but there's no minor buzz during quiet parts like the Fosi has. The treble and bass knobs are a great little touch.