HTC DROID Incredible - Manual (Page 26)

 Basics
Top panel
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14 POWER
When the phone is off, press to turn on the phone.
When the phone is on and the screen is unlocked, press to turn the
phone display off or on.
With the screen unlocked, press and hold to open the phone options
menu that lets you turn off the phone, switch your phone to silent mode,
vibration mode, or airplane mode, and turn on/off the data connection.
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15 3.5mm audio jack
Connect a .mm stereo headset for hands-free conversation or for
listening to music.