If you have lost your Sony WH-CH710N manual, there are a few options you can consider: Download the manual from the Sony website: You can visit the Sony website and navigate to the support page for the WH-CH710N headphones. From there, you should be able to download a digital copy of the manual. Contact Sony customer support: You can contact Sony customer support and request a replacement manual be sent to you. They may be able to provide a physical copy or a digital copy of the manual. Check online resources: There are many online resources available that offer user manuals for a wide range of products, including the Sony WH-CH710N headphones. You can try searching for the manual on websites such as ManualsLib or ManualsOnline. Regardless of the method you choose, it's important to have access to the manual in order to fully understand the features and functionality of the Sony WH-CH710N headphones.