When we buy new device such as Plantronics CS351N we often through away most of the documentation but the warranty.
Very often issues with Plantronics CS351N begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Headphones Plantronics CS351N is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Headphones on our side using links below.