you get back button on the front. It's the big button that apple products seem to use.
The other two main buttons (Menu and the switcher) are the volume up and down. You're probably wondering where the hardware volume control is; well it does not exist. You need to use the menu controls. Which sucks when a game starts up with no access to the top pane (where there is a quick volume up and down soft button) and automatically turns the volume up to max. (look at you retro defense)
Hope this has been helpful.