Use one headset for both your phone and computer; with speech recognition software installed, users interface directly with the computer through a Plantronics headset. Ideal for computer-based training, desktop conferencing, and use by disabled employees. Easy to operate with simple button controls for headset/handset and telephone/audio selections. Compatible with most audio devices such as computer sound card, voice/fax modem, CD player, etc. Separate controls for independent volume adjustment. Accessory Type: N/A; Voltage: N/A; Power Source(s): N/A; For Use With: N/A.