For music, games, speech recognition, Internet chat/telephony, and video conferencing, the Plantronics .Audio 70 Behind-The-Head stereo PC headset features awesome stereo sound and a superior speech-recognition microphone for improved voice recognition accuracy. Equipped with convenient inline volume and mute controls and a QuickAdjust microphone boom that ensures correct placement for speech applications. The flexible headband and soft, swivel-mounted ear cushions let you work or play in comfort. Compatible with popular PC sound cards, just plug it in and start talking. MacOS users may require an additional adapter.