HD MX Player 2019 is a free multimedia player for Android phones and tablets. The app can play all video and audio formats, including 3GP, AVI, MP4, M4V, WMV, RMVB, MKV, and many more. It supports hardware acceleration for faster and smoother video playback, and can even play back videos in the background.

It has a customizable interface and support for multiple audio and video playback streams, which makes it one of the most powerful media players on the Android platform.

The player also supports a variety of playback controls, including volume, brightness, and rotation. It can also be configured to automatically start playing back videos when the phone is locked.