Tired of sweating all day long? You can’t take your regular air conditioner with you but the Tajima Seiryo Jacket Cooling System serves as your portable air conditioner. It has a 3 speed fan to get the job done. Simply clip it on the back of your belt, slide it beneath your shirt, and turn it on.
The fans run on a 5500mAh battery that lasts up to 8.5 hours (depending on speed). More info is available here.