The mini Portable Mosquito Repeller just may be—like the manufacturer claims—the world's smallest and most portable mosquito repellent device. The machine is worn like a wrist watch, and its fan blows mosquito repellent out into your immediate surroundings.
Of course, this versatile device can also be attached to a backpack or left freestanding in your room, and there appears to be no mention of harmful effects on the packaging (particularly if you can’t read Japanese). Two AAA batteries run this thing, and one mosquito repellent cartridge inserted into the device boasts 120 hours of mosquito-free bliss. It'll set you back $14.