It’s a Space Invaders Light Up T-Shirt!!!! This is the ultimate in uber-retro-geekiness (URG). You can get this shirt in your choice of one of the four types of Space Invaders:
This officially licensed shirt is powered by a removable (for washing) battery pack that runs on 4 AAA batteries. It definitely makes a cool statement and costs about $38 from Firebox.
Apace Vision LED Safety Light (2 Pack) with Bonus Items - Clip On Strobe / Running Lights for Runners, Dogs, Bikes, Walking and More, Green