Thanks to the overwhelming, trend-setting popularity of Apple iPad, a number of SmartCover-influenced tablet cases include an auto sleep/wake feature.
The sleep/wake feature is activated with a magnet embedded in the tablet case’s interior. When opened and closed, the tablet screen turns on/off by itself. If this produces the characteristic clicking sound that indicates the sleep/wake function, all the better.
Naturally, the sleep/wake function is seen in any SmartCover-like tablet accessory. The feature may also be found in several folio and portfolio cases designed specifically for the iPad.