This paper introduces a wearable computer as a wearable personal station. We propose and implement wristwatch-style wearable personal station and its I/O devices in this paper. Nowadays the progress in miniaturizing more powerful computer systems and the availability of various devices around wearable computing will bring this technology to the edge of a new quality. Wearable computing is starting to become a product by itself. The function components of our wristwatch-style wearable computer include watch, PDA functions such as PIMS, address book, portable multimedia features, personal communication features and so on. We miniaturized these functionalities into our wearable small device. We also handle a study of USB implementation without wires for human interfaces. This paper describes a platform, hardware specifications and applications we have developed.