This one does not have a button to start/end calls while the X1 does. However, the product description is not clear on this. If your phone supports the headset button feature, I strongly recommend the X1 version, which often is the same price or less (at least it was when I bought it).Other than that it has great sound quality and is durable. Some may not find it all that comfortable owing to the rigid plastic ear piece that slightly enters your ear canal, but it does not bother me.