Portland Design Works crafted the Asteroid USB Tail Light for the urban commuter seeking powerful illumination and added safety when you're cruising around after dark. This compact tail light features a double-click lens that toggles through its flash, pulse, and steady lighting modes. Its faceted lens projects light across a wider swath for increased visibility to passing traffic. Best of all, the USB-rechargeable battery lasts up to 35 hours of continuous use and rapidly charges by plugging into any USB port or wall outlet.