... music files, both speaker and headphones.2. MP3 playback without headphones are inserted, the machine ... function.4. With a user-friendly bicycle clip.5. Portable Memory function :Because Speaker has ... Line-in function, can be an attachment notebook, mp3, m4, iphone8. All function in one interface ... design9. USB high speed transmission10. Applicable to MP3, MP4, Laptop, PC, MD, Mobile phone, ...