Spare headset for S10, T10 and T20 Plantronics 45647-04 Replacement headset for 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.Package Contents: One Headset, One Headband, Earhook kit (3 sizes), One Leather Ear Cushion, One Pivot Ball and Ring, One Clothing Clip.