Okay, I had the same mouse before but with a different "grey" color to be exact. The model is the same BM308. And the sleep mode worked perfectly, after a while you just have to move the mouse and everything works fine, no complaints. Even with games. So unfortunately I broke my old mouse by dropping it a couple of times)) and decided to buy another one but in a different color which is "black" or even glossy black because of it how polished is. Now the sleep mode is just crazy, first I have to press the button to wake it up after a few minutes. Second, it disconnects from Bluetooth from time to time and then starts blinking and reconnects. This can be very annoying when playing games or browsing websites. Although this happens once or twice a day. It seems that the color of the mouse is not just a color, but also a different hardware behavior! Don't buy black! Also, you can see that the price is a bit lower than other colors. Now it's clear why
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