Buttons on RC4 Series 3 devices can invoke different features by operating the buttons in different ways. One way is to press and hold a button for several seconds. This is called a long-press.
When using long-press features, care must be taken to avoid accidentally slipping in a way that produces a button tap rather than long-press. When this happens, the feature that is assigned to a tap will be invoked, rather than the desired long-press function.