MP4 player with built-in speaker, you can not use an external speaker, you can also avoid a long time with the inconvenience of headphones.
Built-in speaker is the MP4 player with built-in speaker, so that users can not only through the headphone jack can also be built-in speakers to listen to the sound of MP4 players.
The speakers are divided into built-in speakers and external speakers, while the external speakers are generally referred to as speakers.
