no complaint . I replace my wire keyboard and wire mouse with this set , and I can see no difference in reaction time , which be a good thing . I just plug in the blue tooth device into the usb port on my HP minus and both the keyboard and mouse start work immediately with no software to download . I move the keyboard all over my desk and it work from every location I have try , which would be up to about 4 foot away . both the mouse and keyboard respond immediately to my action . I do not know what else to say . it work .