The device is good, I use it with pleasure. IMHO the price is too high due to popularity. On the Internet, everything is only praised, so I will write in more detail all the minuses that I found. Gave 4 stars due to not being perfect. Otherwise, how many stars should be given to ideal products? ————————— ate after a couple more weeks ——— 1. I accidentally switched a bluetooth whistle from usb 2.0 to usb 3.0 input and found that the delay had dropped a lot! Although it may have coincided with some kind of ate. Too lazy to test :) But the delay is now very small, you can even drive in the cs :) 2. Found that a single press of the power button reports the level of charge. Now there is no need to climb into an inconvenient application. The charge holds for a long time. 3. Of the minuses, the only thing left is that the bluetooth does not break through 2 walls and while you are making tea, the headphones are disconnected. I'll try whistle version 5.1 one of these days (now 4.0), maybe it will change the situation. All the same, I return the star - 5 stars. The app is so-so but everything else is well thought out.