The Ruizu X50 mini HiFi lossless MP3 player is compatible with Bluetooth speakers and headphones so it offers perfect compatibility and low power consumption. It has an FM radio function and will require wired headphones to play the radio. MP3 player comes with music playing, FM radio, voice recorder, AMV video, e-book TXT file, pedometer, etc. This MP4 player supports memory cards up to 128GB. You can stick it in your pocket and enjoy music without any hassle while running, riding, hiking, or doing other exercises.