how do i check whather my IEM is regiestered for two year warrenty?
If you bought it new and from a retailer, there's a postcard inside for you to mail. Alternatively, you can go to a certain link indicated on the postcard to register it online.
If you bought it second hand w/o the postcard, ask the original seller if he/she has registered it. If not you can just find the link to register your unit. The additional one year starts from your original date of purchase, not when you register.