volt battery

When you´re tearing downhill on your snowboard, it´s a little distracting to take off your glove and dig out your iPod just to, say, hit pause. Instead, build this simple radio-frequency ID system and control your iPod by waving your hand in front of your coat.
A tag sewn into your glove sends instructions to a reader stashed in your pocket.
Unwire Your iPodCost: $161Time: 6
HoursEasy | | | | |
Hard

The Five-Minute Project in the November 2006 issue, â€The Nine-Volt Safe,†involved sliding off the top of a nine-volt battery. Although experts advised us that it is not normally dangerous, and we tried the project ourselves without incident, it has come to our attention that in rare instances, the cells inside the battery can â€vent†or rupture, potentially exposing the handler to the chemicals inside. Given even the small chance of injury related to this project, we advise you not to undertake it.