The app is totally safe for downloading. MMR Projetos is the official developer of MMR CheckIN that can be found in the Travel & Local category. The developer rolled out a new version of this application on Apr 7, 2017 and over 10 users downloaded and set up the tool.
It's free of charge to get the installation package of MMR CheckIN, also, you can check out users' reviews on Droid Informer. The app runs on Android 2.3 and higher.