Long Battery Life: This M503 Pro Bluetooth MP3 player has a built-in 2000mAh Li-Ion battery, the whole machine adopts low-power solution, which can continuously play 45 hours (resting playback) - 50 hours (maximum brightness and volume) of music, and watch 4 hours of video continuously. It is your indispensable travelling or sports walkman music player.
Big Memory Android MP3: The Bluetooth MP3 player is powered by Android operating system and built-in 8-core MTK6750 chip, which makes it run faster and smoother. Meanwhile, the music player comes with a 64GB memory card that supports expanding external storage up to 512GB.