1USB Rechargeable: With a built in 1500mAh battery, there is no need to use AA batteries or always plug the charging cable into the CD player when playing music. The portable CD player can be fully charged in 4 hours. Playback endures 5 hours with a built in speaker. 2With Speaker: This portable CD player is with a built in speaker which produces loud sound, so listening directly from the speaker is another option than wearing the provided stereo earphones. It is also an outdoor speaker, which could be taken and used where you go. 3Anti Skip and Memory playing: The CD player has an anti skip function to ensure uninterrupted playing even when exercising or driving. And this function will be activated automatically once we turn on the player. The memory playing function enables us to continue playing the track played the last time we turn off the player. 4Wide Compatibility: This compact CD player can support most CD formats such as CD, CD RW, MP3. AUX connection with all other listenable devices such as external speakers and cars with 3.5mm AUX jack via AUX 3.5mm input. There is also a USB port. You can enjoy the same song with your family or friends whether at home, car or travel. 5Portable Gift: Portable CD player is a good choice for a loved one, family member, classmate, friend, or workmate. Multifunctional CD player, support CD disk, U disk and external input sound playback.