Plantronics Calisto 400 User Guide - Calisto P420 USB - Page 5

2 Setup 2.1 Connecting USB speakerphone to PC NOTE When the P420 is installed, it becomes the default audio device in your computer. You can set preferences manually in the Windows® operating system through the Sounds and Audio Devices option in the Control Panel. 1 Connect the USB cable to the USB port on the back of the speakerphone. 2 Connect the other end of the USB cable to the USB port on your computer. A blue light will illuminate through the buttons on the top of the unit indicating the speakerphone is powered on and operating. 2.2 External speakers/headphones Connection The P420 is equipped with a 3.5 mm stereo headphones/ external speaker connector. Connecting your computer's loudspeakers (or headphones) to the P420 will disable the P420 speakerphone's internal speaker. Your computer's audio (music, VoIP communication or any other) will be passed through to the external speakers, maintaining the same sound quality your computer can deliver. While the internal speaker is disabled when using this connection, the P420 speakerphone's internal microphone is still functional. Plantronics P420 USB Speakerphone 5