Easily change resolution and density (DPI) - take full advantage of the resolution of your external display, and show the Android tablet interface if you're using a phone
Simple profile-based interface - easy to enable/disable different profiles for different types of displays
Many configurable options, including:
Automatically enable Bluetooth and Wi-Fi - quickly connect a keyboard, mouse, and/or game controller
Automatically enable Daydreams
Show desktop sites in Chrome by default - browse the real Web, on your TV!
Lock screen orientation to landscape
Overscan support for older TVs (Android 4.3+)
System-wide immersive mode (Android 5.0+)