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Official Description

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Coffee Buzz is the easiest and safest display-sleep preventer available, with simple operation and exclusive Safety Auto-Shutoff feature. Keeping your Mac awake (and letting it sleep again) is as simple as a click!

Features include:
• Flexible user interface that works as both a window and as a menu bar status item (or both at once)
• Three easy-to-use settings:
◦ Buzz mode: Keeps the display awake
◦ Doze mode: Lets the display sleep but keeps the computer itself awake
◦ Off: Allows you to disable the caffeinated effect without having to quit Coffee Buzz
• Timer that can be controlled from both the window and the status bar
• Configurable automatic mode switching when the power adapter on a portable Mac is connected or disconnected or the battery gets low
• Exclusive Safety Auto-Shutoff feature designed to prevent accidental display damage or burn-in. While not intended to be a substitute for responsibility and care, Safety Auto-Shutoff can keep a mistake from turning into an expensive headache.

Note: This app cannot prevent your Mac from sleeping if you use the Sleep menu command or close the screen on a portable Mac. This used to be possible in the past, but OS X no longer allows apps to circumvent the user's direct commands to enter sleep.

Comments, questions, and feedback are always welcome. Please visit Coffee Buzz Support for more information.