Thanko, the Japanese company, has released a set of unusual gadgets – fans for armpits. The devices are mounted on the sleeves of a shirt or shirt, with the holes directed inward, in the area between the shoulder joint and chest. Fans cannot be called miniature and inconspicuous, but they do their job. The device receives power from two AAA batteries, or through a USB cable when connected to, for example, a laptop. The charge of batteries or accumulators, according to the manufacturer, lasts for 5–9 hours of continuous operation (depending on the mode selected). It is believed that fans will suit people in hot countries and those who suffer from excessive sweating.