Here is a cool accessory that turns your iPhone or iPhone 5S into a thermal imager. You will be able to see even when there is no light around you. The device lets you translate thermal energy into dynamic color images. You will be able to see in to total darkness, observe heat sources, and even play games with this.
FLIR One can sense wet areas that may be invisible to you. You can even use it to see heat sources outdoors. It can show you people and animals, so you will know what’s coming your way. I would love to see this technology made available for other devices on the market. It is one of those shut-up-and-take-my-money items though.