[. . . ] All units serviced to full production standards using original factory parts. DuoPro, Quick Disconnect and the clear color and curvature of the voice tube are trademarks of Plantronics Inc. [. . . ] Ensuring that the pivot pin holder on the headband is facing forwards, push the pivot pin on the receiver into the pivot pin holder. Press the headset cable into the cable stabiliser channel and then connect the headset cable to your telephone or amplifier. Position the noise-cancelling microphone or voice tube towards your mouth. Adjust the position of the boom by either raising or lowering the boom or swivelling the headset forward and backwards from the pivot point. Push the pivot pin on the receiver into the pivot pin holder on the earloop. Press the headset cable into the earloop cable retainer on the earloop and secure within the notches. To position the headset move the earloop away from the receiver and place the earloop over your ear. Position the noise-cancelling microphone or voice tube towards your mouth. Adjust the position of the boom by either raising or lowering the boom or swivelling the headset forward and backwards from the pivot point. To convert the headset for left ear use, first pull out the front part of the boom (on noise-cancelling models) then rotate it downward so that it faces the opposite direction. Quick DisconnectTM Connector ­ This feature allows you to move away from the telephone wearing your headset without disconnecting your call. Clothing Clip ­ The clothing clip helps to keep the headset free from the weight of the headset cable. [. . . ] Plantronics guarantees the satisfactory condition of the equipment with regard to manufacturing and material defects for 2 years from the date of purchase. This product should be installed and used in accordance with the instructions detailed in this user guide, and serviced at an approved Plantronics Service Centre. [. . . ]