Features:

• Built-in microphone and loudspeaker
• Small footprint design
• USB interface - for desktop and laptop use
• Stereo 3.5 audio jack for external speakers and headphone connection
• Mute Button, Volume Up and Volume Down Buttons
• Acoustic Echo Cancellation, Line Echo Canceling, Noise Suppression, Voice Level Compensation

Duet PCS Datasheet (pdf)