Patent ID: 7148807

Claim:
An information transmission system comprising: a first information transmission apparatus comprising a first battery, a first remaining battery power amount detector, a first transmitter/receiver, and a first display; and a second information transmission apparatus comprising a second transmitter/receiver and a second display; wherein: when a remaining battery power amount of the first information transmission apparatus is decreased to be lower than or equal to a first threshold value, the first display displays information indicating that the remaining battery power amount is low; when a remaining battery power amount of the first information transmission apparatus is decreased to be lower than or equal to a second threshold value, the first information transmission apparatus transmits remaining battery power information of the first information transmission apparatus to the second information transmission apparatus, and the second display displays the remaining battery power information of the first information transmission apparatus; and wherein the first threshold value is larger than the second threshold value; and wherein: when a remaining battery power amount of said first information transmission apparatus is decreased to be lower than or equal to a third threshold value, said first information transmission apparatus is controlled to respond only a command having a higher significant degree within commands transmitted from said second information transmission apparatus to said first information transmission apparatus.