A moving state detecting section 202 determines a moving state of a share source terminal 100. Based on the entered primary follow-up time period, the visual alert device computes a preliminary and a final follow-up time value, which are associated with a level of response priority that is visually represented by the illumination of corresponding illuminable color segments. And when carrying it around, the display operating unit is to be disconnected, and the reproduced data stored in the bulk storage means are displayed on the display means based on the operation of the key signal entering means. The at least one latching mechanism includes a latching body, and the latching body is configured for selectably engaging with the positioning stop member to enable control of movement of a corresponding speaker device relative to the main body. The nano-sized zinc oxide particles can be used to either improve combustion or increase catalytic chemical oxidation of fuel.