View here the free Sony NW-MS77DR manual. Have you read the manual but does it answer your question? Then ask your question on this page to other Sony NW-MS77DR owners.
Ask the question you have about the Sony NW-MS77DR here simply to other product owners.
Provide a clear and comprehensive description of the problem and your question. The better your problem and question is described, the easier it is for other Sony NW-MS77DR owners to provide you with a good answer.