The firefly from Raptor Tactical

There can never be enough flashing lights. Raptor tactical thinks so too and has recently introduced their new TET Firefly to the market. It measures 45 x 50 x 18mm, weighs 23g, is waterproof, and can flash or emit a constant light.

Available colors include Green, Red, Blue, White, and Infrared. The battery life varies depending on the color, and the battery is not user-replaceable. If you want a firefly for your gear, TET Fireflies are available at Raptor tactical for $18 each.