The issue with the receiver is that after two months of heavy use, problems started occurring, specifically: when the left mouse button is held, a double-click happens, and while the button is physically engaged during a drag-and-drop operation, the button is released. I have discovered a method for locating a bug; all that is required is to create a selection on the desktop or in the explorer; anywhere from one to ten minutes later, the selection will vanish when the left mouse button is physically pressed. There is support (support on the site) in 2022 for Logitech products, as is customary, and this is what they responded to my letter with: Because we do not support USB hubs, the receiver must to be connected directly to the computer in order for it to work. This is the reason why such items are not disclosed on the website; instead, a Limits section may have been inserted between the advertising Features and the Specs. "since it is evident and widely known that radio devices might interfere with one another, it is imperative that you test the device on a different personal computer." I complied with the suggestion, so now the radius of action is only 1 meter, rather than 10 meters. The system unit is under the table, before I could go to the kitchen and control the mouse (my wife and I tried), now if I move 1 m away from the computer, the mouse stops working. I was forced to reduce the size of the wireless router; unfortunately, this did not help. "A requirement for receiving warranty assistance is to be able to establish a connection to another computer. Please look into the possibility of testing the item on a different personal computer." "Please be aware that Logitec products are not eligible for repair, and if they malfunction while still covered by the warranty, the product will be replaced." "We regret to inform you that we are unable to facilitate device replacements in the Ukraine at this time." These are the pies from Logitech, I ordered A4Tech G10-770L - very similar to Marathon, but half the price, but it only has 1xAA battery batteries - the main reason why I bought Marathon
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