If your device has a proximity sensor.. Close cover, and Device automatically goes to sleep !
Smart Cover v1.0 market.android.comsmart.cover
If your device has a proximity sensor.. Close cover, and Device automatically goes to sleep. Open cover, and Device instantly wakes up.
Any Tablet, Any Phone, Any Cover.
For example, Galaxy note's flip cover, Galaxy tab's cover, Acer iconia's cover, Leather cover, Diary cover, Book cover etc...
Required Android O/S : 2.1+
Screenshots :