Sure, your flashing, chip-tune playing t-shirt is really cool at the party... but at some point you need to turn it off. And yes, you could just pull the battery, or maybe you've even sewn a LilyPad slide switch in-line. Wouldn't it be nice if there was just a switch the battery? Well look no further. Project description, more information and ordering can be found at https://www.sparkfun.com/products/11285