Customised MP3 Player

We need bulk quantity of customised mp3 player - should have followed features. 1. LCD / LED display required (where playing file name should be displayed) 2. 8GB Internal memory SD/TF card is required ( Thats predefined content - user wouldn't be able to remove or tamper the content) 3. USB port 4. A good quality speaker (3W / 5W) 5. Battery back up and adaptor (Minimum 4 hours battery back up) 6. An option to add files to favourite and play back from it 7. An option for sleep timer to turn the device off after a specific time.