Most of the features and battery lives (ie, the different times using WiFi, 3G, talk time and so on) are the same or higher than earlier versions of the iPhone.
Demonstrating simple procedures such as properly charging and inserting the battery, inserting a tape or memory card, and selecting the correct recording mode eats up classroom time when using a regular camera.
Drivers can also refresh the battery via any standard 120-volt outlet using the included charging cord, though this would take at least twice the time as with a 240-volt line.