Abstract: Provided is a double container where an inner bag can be easily pulled out from an outer shell. According to the present invention, a double container comprising a container body and a mouth part attachment member is provided. The container body includes a mouth part and a body part and a bottom part. The mouth part is a tubular portion having an open end. The body part is arranged adjacent to the mouth part on a side farther from the open end than the mouth part, and has a larger outer diameter than the mouth part. The bottom part is configured to close a lower end of the body part. The container body includes an inner bag and an outer shell arranged to cover the inner bag. And the mouth part attachment member is configured to be attachable to the mouth part, and is configured such that the inner bag rotates as the mouth part attachment member rotates.

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.