The app is completely secure for downloading. Alexander Hacker is the creator of SBF-Teacher which is included in the Educational category. The tool was downloaded and installed by over 10K users and the latest stable release was on Jan 19, 2015.
This application has the overall rating 4.1 on Google Play. Take the opportunity to get the installation package of SBF-Teacher 2.0.5 for free and have a look at users' reviews on Droid Informer. The app is available for Android 2.1 and above.