Portland Design Works offers the power of an LED automobile taillight in a smaller package.

• Includes Stayputnik quick release taillight mount, fits up to a 31.8 seatpost and attaches without tools
• 1.0 watt Japanese LED: same LED used in car taillights
• Features crescendo flash pattern
• Run time is 50 hours
• Two AAA Alkaline batteries included
• Requires the on/off button to be depressed for 1.5 seconts to be turned on or off so the light doesn't unintentionally get turned on when stowed in a bag or satchel
• Battery: 2, AAA Alkaline, 3(V), 3.8(Wh), Included