• Plantronics Part# 45647-04
• Monaural - over the ear headset
• Replacement headset for S10, T10 and T20's
• Can plug direct in to some phones that support that
• No quick disconnect on this headset, straight cord in
• Replacement headset for Plantronics T10, T20, T50, S10 and S50 headset systems. Versatile headset converts from headband to over-the-ear style. Noise-cancelling microphone for crystal clear calls.