This is a heatstroke prevention vest with a blower fan. 10V Lithium Battery Charging Adapter 2 Fans Used about twice, then stored at home because it didn't suit the work environment. ■ The vest has three adjustment elastics, but (they seem like they might stay stretched out if pulled). To check the battery life, I did a test run. After a full charge, it ran continuously for 6 hours and 10 minutes at maximum airflow (level 5). ■ Purchase price: Approximately 20,000 yen 【Manufacturer's Description】 The airflow of the blower fan can be adjusted in 5 stages. Continuous operation is possible for 6.5 hours even at maximum airflow. Two fans are operated by one battery. The double fans cool and refresh with evaporative cooling, cooling the armpits. ● Vertical/horizontal battery case that allows the battery to be used in any direction. ● Anti-slip function to prevent the blower fan from shifting. ● Blower fan (single) size: 74.5 x 75 x 36mm - Weight: 102g - Air speed: 7.4m/S (no load). ● Dedicated vest: Free size (up to 110cm waist) - Weight: Approximately 106g. ● Lithium-ion battery size: 23 x 72 x 140mm - Weight: 300g - Capacity: 10V, 4700mAh (47W) - Output: 10V, 9V, 8V, 7V, 6V, 5V - Charging time: Approximately 7 hours. Heatstroke prevention vest