Abstract: A wireless communication system is provide that includes deep body temperature sensors that include a measured deep body temperature into an advertising packet that is then transmitted. A display unit displays a measurement result of a deep body temperature. When the wireless connection to the display unit is not established, each of the deep body temperature sensors includes a result of determination of whether it is stuck to a human body into an advertising packet and transmits the advertising packet. In an aspect, the display unit is wirelessly connected to a sensor stuck to a human body among the deep body temperature sensors.

Abstract: A biological device that includes a case, an electronic unit, a gas-liquid separator, and an insulating sheet. The case is wearable on a body. The electronic unit is in an internal space of the case. The gas-liquid separator is attached to the case. The insulating sheet is attached to the case. The case has a communicating hole that connects the internal space and an external space of the case along a first direction. The gas-liquid separator and the insulating sheet are disposed apart from each other in the first direction. The gas-liquid separator, the electronic unit, and the insulating sheet overlap each other in a plan view of the biological device in the first direction.