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I was pleasantly surprised to see an actual scroll wheel on the upper right side of the iPAQ 910. An OK button can be found below the scroll wheel.
The volume control button is located on the upper left side with the Voice Command activation button below it.
There are covers for the microSD card slot and miniUSB port on the bottom left side. There is no standard headset jack on the iPAQ 910, but you get an HP wired headset in the box that connects to the miniUSB port.