1RECHARGEABLE CD PLAYER: Built in 2000mAh battery, no need to use AA batteries or always plug the charging cable into the CD player when playing music. Fully charged in 4 hours. Built in speaker for up to 5 hours of playback. 2SPEAKER FUNCTION: The portable CD player has a built in speaker that produces loud sound. It can also be used as an outdoor speaker that can be taken wherever you go. 3ANTI SKIP FUNCTION: The CD player has an anti skip feature that ensures uninterrupted playback. This feature is automatically activated once the player is turned on. 4MEMORY PLAY FUNCTION: CD music player has a memory play function that enables to continue playing the tracks that were played the last time the player was turned off. 5WIDE COMPATIBILITY: Can support most CD formats such as CD, CD RW, MP3. AUX connection via AUX 3.5mm input with all other list enabled devices such as external speakers and cars with 3.5mm AUX jacks. There is also a USB port. Bluetooth wireless connection for easy operation.