Features:

SD /MMC card and USB flash disk support, can play MP3  music files.

Suitable for devices equipped with a 3.5mm audio jack, including cell phones, MP3 players, portable CD players and laptop/desktop computers.

Built in power amplifier, high-fidelity magnetically-shielded speaker and sphericity bass, wonderful music is presented.

Powered by built-in lithium battery, AAA battery and USB port, can play music continuously for long time.