"Wi-Fi sync Screen" synchronizes Wi-Fi-enablement with the screen power.
If you disable Wi-Fi-sleep "Wi-Fi sync Screen" will be helpful to save the battery.
Don't make "Wi-Fi sync Screen" coexist with the other applications that modify Wi-Fi configuration automatically.


Enduser lisence agreement (EULA)
http://fujiu.jp/AndroidApp/app006_wifisyncscreen/wifisyncscreen_eula.shtml