Bluetooth Stereo
Here’s what I used it on. Bought this remote control cooler off Craig’s List & the Bluetooth didn’t work. I hooked the existing speakers up to this and wired it up to 12v switched power and taped the volume control on high. I have it mounted inside the cooler where the motors are. It sounds really good & has a lot of volume playing in the house & outdoor. I control the volume on my phone.
The only slightly annoying thing is that it says “Bluetooth on” when you turn the power on. Haven’t tried one in a car, but I suspect you could mount it where you could reach the volume control. There are other fancier ones that have more controls.