According to my father's report, there is expected noise for the device, and the sound looks a lot like the small models with battery. Good for being rechargeable.
Not as clear as the 3,000 dollar ones, but great for the price.
thank you, robert.
Thanks to the seller for a quick and accurate order. The device is small, neat, you can adjust the volume with your fingernail, the device came charged, it works well.