This is a bit silly, but OK. Tokyo-based accessory maker Thanko has developed a very special gadget that’s supposed to help you fight the summer heat: a necktie clip [JP] that’s attached to a mini fan, which is powered via USB.
The clip weighs 28g. You can cool off yourself by either connecting the device directly to a USB port of a computer (when you’re sitting at your desk) or by plugging it into a battery unit (see below).
Thanko is selling the USB necktie clip cooler in their Japanese online store for $35 (battery unit included). If you’re interested but live outside Japan, wait for the Japan Trend Shop to (maybe) list it – alternatively you can browse their store for other unique cooling gadgets.