Product Description 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. From the Manufacturer The Plantronics MX10 Universal Amplifier for Headsets allows you to use a single headset with a telephone and a computer, sound card, voice/fax modem, or external audio device such as a CD player without ever having to switch headsets. With a quick disconnect feature, you can move away from your phone without removing the headset or disconnecting the call. Extremely easy to use, the MX10 works with your choice of Plantronics headsets and includes near-universal compatibility with single- and multi-line phones. (However, the MX10 is not compatible with cordless telephones). The MX10 has ergonomically designed controls for headset selection, volume and mute functions.What's in the Box MX10 universal amplifier, lightweight 10-foot coil cord.