Its new smart phone from microsoft that comes with latest os windows 10 and dock that turns your mobile into full pc.
Its a unique feature that only at present from microsoft only.
Microsoft promised that they will provide further updates also , so you always will be updated. The handset has great camara that works great in low light. But windows store dont have apps like android or apple does, but all basic apps are have there store, so overall its good mobile to buy.