The iPod Mini used the touch-sensitive scroll wheel of the third generation iPod. However, instead of the four touch buttons located above the wheel, the buttons were redesigned as mechanical switches beneath the wheel itself—hence the name "click wheel". To use one of the four buttons, the user physically pushes the edge of the wheel inward over one of the four labels. Like its predecessors, the wheel was developed for Apple by Synaptics. The click wheel is now also used in the fourth, fifth and sixth generation iPods and the iPod Nano, from first generation through the fifth; however, in the Nano and 5G iPods onwards, the click wheel used was developed by Apple.