Handy little light,
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This review is from: Knog Light Gekko Rear Light (Sports)
Fixed to seat post very easily and does not move at all.
Obviously gets debris thrown at it but is easy to clean, just make sure you take the insides out first as not waterproof. When refitting make sure the button is at the bottom as the LED's are angled.
Has several modes of flashing as well as continually on. Battery life good.