Next, another research using ARTag is an augmented reality application for earrings which was implemented and discussed by Kerdvibulvech in [12]. This system allows a user to try virtual earrings like a real earring. The operation of ARTag is to detect a tag (i.e. ARTag marker) by using a single camera for creating simulation of 3D virtual image and displaying it on a computer’s screen. Based on this technology, the 3D earrings simulator is developed by ARTag. This system helps users to try many products in 3D simulation by themselves as shown in Figure 7. The users can order the earrings through the online system as a trading process.