If order is sent by registered delivery, a reference number will be given by Postal Office.
In light of the registered number, the parcel can be tracked from the postal office of destination in case the parcel does not turn up in the expected time frame. In other words, it increases the reliability of delivery to customer.
The normal expected time frame is 1-2 weeks. However, it could suffer delay up to 4 weeks due to the loading of post service in the designating countries.