The present utility model provides a wearable temperature-reducing device, comprising an arcuate body, which comprises a flexible outer wall and a cavity enclosed by the flexible outer wall. The cavity comprises an internal capsule, a phase-change layer located in the internal capsule, and a heat-conducting layer located between the flexible outer wall and the internal capsule, and the arcuate body forms an enclosed space for wearing. The wearable temperature-reducing device of the present application is mainly intended to be worn by humans, and has the advantages of being easy to wear, simple in structure, environmentally friendly, etc.

An arousal state control system includes a sensor, a stimulation control unit, and a stimulator. The sensor acquires biological information of a user. The stimulation control unit determines, based on the biological information, one or more types of stimuli to control a state of arousal of the user. The stimulator applies the one or more types of stimuli determined by the stimulation control unit to the user.

Disclosed is a refrigerable hanging ice neck collar, which includes a neck collar bracket, a heat dissipation component, a refrigeration sheet, a fan, a non-metallic shell, a cold storage material layer and an electronic control component. The neck collar bracket and the non-metallic shell are respectively elastic, and the electronic control component is used to control the cooling of the refrigeration sheet and the rotation of the fan. The fan rotates to supply air into the air duct, and the through hole in the air duct is used to connect the heat dissipation component. When the wind in the air duct passes through the through hole, it will take away part of the heat of the refrigeration sheet and dissipate heat and cool the refrigeration sheet, and the air outlet can also provide airflow to blow toward the head.

A neck fan includes an arc-shaped shell and a fan assembly. The arc-shaped shell is configured to be worn around a neck of a user. The shell has a first side and a second side opposite to the first side. Each of the first side and the second side defines air inlets. At least one of the first side and the second side defines air outlets. The shell further defines a receiving space, and the receiving space includes an air duct communicating with the air inlets and outlets. The fan assembly is received in the receiving space and configured to drive the air to flow from the air inlets of both sides, through the air duct, reaching the air outlets.