Product Sheet
Page 1
... service and support Microphone mute button Headset button Speakerphone button Presence/status light For more information about the Calisto 540 or other countries. and other Plantronics products, please visit our Web site at: plantronics.com TEL: 800-544-4660 (U.S. up to PC telephony Audio performance Wideband - The integrated speakerphone and headset option provides hands...
... service and support Microphone mute button Headset button Speakerphone button Presence/status light For more information about the Calisto 540 or other countries. and other Plantronics products, please visit our Web site at: plantronics.com TEL: 800-544-4660 (U.S. up to PC telephony Audio performance Wideband - The integrated speakerphone and headset option provides hands...