The 4 Sides of Your iPad's Exterior
On the top of your iPad, you find the headphone jack, microphone, and the Sleep/Wake button.
Sleep/Wake button: This button is used to put your iPad’s screen to sleep or to wake it up. It’s also how you turn your iPad on or off. To put it to sleep or wake it up, just press the button. To turn it on or off, press and hold the button for a few seconds.
If you use an Apple Smart Cover or Smart Case (or any of the third-party cases that use the Smart Cover mechanism), you can just open the cover to wake your iPad and close the cover to put it to sleep.
Headphone jack: This jack lets you plug in a headset. You can use the Apple headsets or headphones that came with your iPhone or iPod. Or you can use pretty much any headphones or headset that plugs into a 3.5-mm stereo headphone jack.
Strictly speaking, a headset includes a microphone so that you can talk (or record) as well as listen; headphones or earphones are for listening only. Either type works with your iPad.
Microphone: The tiny dot in the middle of the top is actually a pretty good microphone.