The Light-up Safety Helmet Strobe from Sparx Line was designed to fit the curvature of a bicycle helmet to increase a bicyclist's visibility. Six ultra-bright LEDs automatically activate with movement and turn off when not riding. There's also an override on/off switch. The strobe permanently affixes to the exterior with peel-and-stick, water-resistant tape and is visible for up to half a mile. The included lithium batteries are easily replaced. Launch date: September 7, 2008.