FIIO BTR3K Heaphone Amplifier Bluetooth 5.0 HD CSR8675 DAC 2xAK4377A - reviews - There is 1 review.

Very low output
I bought this in the hope to improve my listening experience when using mobile devices and to be able to use wired earphones with devices that have only bluetooth (and no more jack plug). The output is at best limited to low volume, which makes it unusable in any even slightly noisy environment like a train. Metro ? just forget about it.
Basically, I found this purchase just a loss of money.