Patent ID: 8160449

Claim:
A system comprising a device and a partner device; the system comprising: a reception section that, in a state in which relative positions of a housing of the device and a housing of the partner device are adjusted to a communication-possible position, receives transmission subject information from the partner device by detecting laser light that is incident in a light reception region provided on an outer face of the housing of the device and demodulating the transmission subject information from results of detection of the laser light, the partner device including a first emission section that emits the laser light and a first modulation section that modulates the laser light emitted from the first emission section in accordance with the transmission subject information, and, in the state in which the relative positions of the housings of the device and the partner device are adjusted to the communication-possible position, the laser light emitted from the first emission section of the partner device being incident in the light reception region; a reception condition detection section that detects deterioration of a reception condition in reception of the transmission subject information from the partner device by the reception section; and a control section that, if deterioration of the reception condition is detected by the reception condition detection section, implements at least one of producing a warning and stopping emission of the laser light from the partner device.