When we buy new device such as Plantronics H81(N) we often through away most of the documentation but the warranty.
Very often issues with Plantronics H81(N) 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 H81(N) 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.