We present a novel mobile memory aid tool, called ClickCatalog System (http://www.ht.sfc.keio.ac.jp/atreader/). In our daily lives, we find many interesting items during shopping, in exposition events, or in conferences. We often try to remember them for later recall by writing memos, taking pictures, etc. Those hints (notes and pictures) are, however, easy to be lost. Using ClickCatalog System, users can collect digital records of the items with an easy-to-handle hardware called @reader, which embeds an RFID reader. After a day, they can recall the stored records using a viewer software. The viewer can be operated using the same device, @reader, by manipulating it on a paper calendar (to recall the records temporarily) or on a paper map (to do so geographically). This paper shows the prototype implementation of ClickCatalog System, a range of applications, and, our empirical study using prototype ClickCatalog System.