I have completely tested the keyboard and mouse and it works great! Please note that there is somewhere on the S key as shown in the photos. As mentioned in the listing this is a used keyboard and mouse

The Logitech MK550 Comfort Wave K350 Wireless Keyboard and M510 Mouse Combo offers a comfortable and ergonomic typing experience with its QWERTY layout, Comfort Wave design, and wrist rest/palm rest features. The black plastic keyboard and mouse are wireless and connect via USB, making them convenient for daily use. The multimedia integration and enhanced function keys add extra functionality to the set, while the quiet keys ensure a low noise environment for typing. With a maximum DPI of 1000 for the mouse, this combo is a reliable choice for those looking for a comfortable and efficient keyboard and mouse setup.