I've spent a lot of time with the mouse and the battery life seems to be as described by the manufacturer, but I'm not sure about the comfort. The device is heavy compared to others, I buy it specifically for the merging function, since I have a keyboard with the same function, this part works well, but when I move the USB to another computer, it disconnects. So definitely not what I expected. I have to say that my complaints are more about Logitech than Revain, I received the device in excellent condition.
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