A 9V battery with brains, Roost adds smarts to your smoke detectors
The gadget gods at Thanko have come out with a USB soldering iron. It heats up to nearly 930 Fahrenheit if used with a 9V battery, and 390-570 F when used with USB.
This $5 flashlight connects directly to a 9V battery and can be turned on using a tiny switch on the top.
The 9@9v will beone of the few with this feature on the market.