The ubiquitous computing environment should assist people to enjoy useful information services on a situation-dependent basis. We proposed a location-based information support system with a Compact Battery-less Information Terminal (CoBIT). A CoBIT is an earphone connected with a solar cell . Therefore people wearing it hear sound only when it receives intensity-modulated light. Cameras with LEDs can easily detect some simple signs of the user and position of the CoBIT because it has sheet type corner reflectors. Thus a CoBIT, without an internal energy supply, assists people wearing it to communicate with the environmental infrastructure.