An electronic device includes a main body, a stylus and a stylus fixing assembly fixed on the main body for seating the stylus. The system also includes one or more pointers for each product class, each pointer identifying a seller database in which product data enabling a product transaction is stored for products categorized in the product class. An in situ microemulsion may be formed when one or more surfactant and a polar phase, and eventually some amount of organic phase, contacts the reservoir formation and reverses the wettability encountered in the porous media.