A free app for Android, by SN Tech – Mix Player Editors.

MP4 HD Player – Media Player Video Player is a free and simple app to play videos. The main interface allows you to choose from your device’s storage or the app’s memory.

The application supports MP4 formats. You can also choose to use the device’s built-in hardware acceleration to improve the app’s performance.

MP4 Player allows you to browse through your device’s files and folders. 

This tool is available on the Google Play Store, and you can download and install it on your device for free.