Power Manager is deprecated. While the application should continue to work on the latest versions of Android, there will no longer be official support for the application. Android has improved greatly over the years, to the point that such an application is no longer neccessary.
Pyamsoft is the developer of the app which is listed among the Tools category. The latest update of this application was released on Apr 15, 2017 and Power Manager was downloaded by over 10K users. The average user rating of the app is 4.1.
Get the .apk installer of Power Manager 6.7.0 for free and check out users' reviews on Droid Informer. This setup package requires 2 MB on disk and it works flawlessly on Android 4.4 and above. The security report shows that the app is safe.