Logitech ERGO M575S Trackball, silent switches replaced. [Included Items] Main unit, receiver, box, instruction manual All operations confirmed, in good working order. No connection issues with Unifying or Bluetooth. Disassembled and cleaned for sale, both left and right clicks have been replaced with new Kailh silent switches, and the rotary encoder has also been serviced. *During disassembly, I accidentally broke the sticker on the battery cover where the hidden screw is located (like on the M570), so I've taped it (the 575 series doesn't have a screw there). *Photo 2: Immediately after silent switch replacement *Photo 8: Battery cover taped (no effect on operation)