This is an insanely good light! With 200 powerful lumens and a smart light sensor, this light can auto adjust the light output so that you maintain visibilty all the time. This has a compact design for a light of this power output and is IPX7 Certified - so very much waterproof, and will handle whatever Mother Nature throws at you while on the bike. An easy rubber strap mount finishes this product off nicely.
This is definitely a two thumbs up tail light and is well worth spending the extra coins on.

FEATURES

• Maximum output to 200 lumens
  
• ANSI-Standard certified lumen output and runtime
  
• Water proof to IPX7 standard
  
• Two-lens focused and dispersed optics with side light design for over 270-degrees of visibility
  
• Power status indicator alerts remaining run-time before powering off
  
• Light memory mode
  
• Compatible with saddle rail mount, providing optimal angle for visibility