Battery / Clock DayDream is a free program developed by TORIFUKU Kaiou for Android 4.2 users. It is a simple screen saver that displays the clock and battery. The program utilizes new Daydream features of Android 4.2 that allows users to customize their device's display settings. Users can easily set up the screen saver by accessing the [DayDream] -> [Settings] -> [Display] menu.

The program is straightforward and easy to use. It displays the current time and battery status, making it a useful tool for users who want to keep track of their device's battery level while also having a screensaver. The program's features are limited to displaying the clock and battery, but it does its job well. Overall, Battery / Clock DayDream is a useful program for Android 4.2 users who want a simple and customizable screen saver.