I’ve used one of these for years while fishing in the Everglades, one of the worst mosquito environments in the world, and it just plain works. I previously used DEET (a known carcinogen), skin-so-soft, dryer sheets, candles, coils, noise generators and other repellents but threw them all away when this showed up. It gives you a 15 foot “bubble” of protection using a butane cartridge to heat a pad of repellent. Riding in the boat does tend to blow out the pilot light in the device but a few clicks of the starter and it’s going again. They have models specifically for hunters (no game alarming scent) and lanterns for your back yard.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.