deepsleep battery saver constantly puts the device to deepsleep mode while screen off during deepsleep mode, wifi, 3g are turned off, background apps are stopped. therefore, most apps are not working, including facebook, google service, etc,. it then constantly wakes up in order to download email, sync facebook status, etc,. it's defined by deepsleep frequency and woke up duration in advanced mode (pro), you can customize more parameters, including day/night settings, active period, screen timeout, sync strategy, ignored apps, etc, features ☆ 5 pre-defined profiles: gentle, balance, strong, aggressive, slumberer. they varies on frequency, duration and other settings. the former is less disruptive, but save less battery and vise versa ☆ custom profile (pro) - for advanced users. if you n