If the residual capacity of a recording medium in an image capturing apparatus becomes five or less, the image capturing apparatus wirelessly transmits a command signal to an image recording apparatus to turn on a power supply of the image recording apparatus. Then, in response to a standby signal from...http://www.google.de/patents/US6701058?utm_source=gb-gplus-sharePatent US6701058 - Image capturing and recording system utilizing wireless communication and image transmission-reception method thereof
