According to the antivirus report, this application is safe and secure. The app is developed by VTork_Interactive and its category is Tools. Google Play shows that Defense UltraSound HD is rated 3.5 by its users.
The latest release was on May 30, 2013 and this application was downloaded and set up by over 50K users. You can get the .apk installer of Defense UltraSound HD 1.0 free of charge and take a look at users' reviews on Droid Informer. This file size doesn't exceed 7 MB and the app can be launched flawlessly on Android 2.2 and above.