Review on Wireless Keyboard Mouse Receiver Ergonomic by Robert Worlds

I have 3 high end windows desktops. Processors I9-9900K and other hardware. I bought three of these keyboards with mice. 2 are very slow. The USB stick is less than 60 cm away from the keyboard and mouse. I've even tried using a USB extender to connect a dongle just 6 inches away from the keyboard and mouse to no avail. Tried several mouse settings in Windows. Removed and newly installed devices. batteries changed. Without change. The device feels nice and heavy, but avoid disappointment and look elsewhere. Very disappointed.