Portland Design Works' Aether Demon taillight is a friendly little devil who wards off approaching vehicles with its winking, blinking, and intensely glaring 0.5 watt LED eye. You can forget about disposable alkaline batteries, because the Aether Demon runs on a lithium-ion battery that recharges via a USB port. Plus it's packed with the highest quality parts from Nichia, Seiko, and Texas Instruments.
• Nichia 0.5 watt LED
• USB charging Li-ion battery
• Texas Instruments integrated circuit
• 4 modes (run time): Dance (8 hrs), Breathe (8 hrs), Group Ride (175 hrs at 10% power), Rock Steady (3.5 hrs)
• 1.5 ounces/45g
• Includes seatpost, seatstay mounts