Use one headset for both your phone & computer; with speech recognition software installed, users interface directly with the computer through a Plantronics headset. Ideal for computer-based training, desktop conferencing, & use by disabled employees. Easy to operate with simple button controls for headset / handset & 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: Amplifier.