Serfas Cosmo 15 Taillight

In stock
Curbside Pickup

Serfas Cosmo 15 Taillight

The Serfas Cosmo 15 Taillight has three LEDs. In addition to standard solid and flash modes, it has a unique animated "KITT" flash mode.


  • USB rechargeable
  • Three 5 lumen LEDs
  • Two solid modes: High (15 lumens/2 hours), Low (7 lumens/4.5 hours)
  • Two flash modes: KITT Flash (5 lumens/14.5 hours), Flash (15 lumens/4 hours)
  • Water resistance rating of IPX3
  • Charge indicator light
  • Battery status light


  • Cosmo Taillight
  • USB cable
  • Taillight bracket
  • Manual
More Information
Crank Arm Length145 mm
BatteryLithium polymer
Charge Time2 hours
Manufacturer's Part #UTL-15
Lumens15 lumens (high), 7 lumens (low), 5 lumens (KITT flash), 15 lumens (flash)
MaterialABS construction
Run Time2 hours (high), 4.5 hours (low), 14.5 hours (KITT flash), 4 hours (flash)
Weight56 g w/ bracket