Does the job,
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This review is from: Bike Lights - Front & Rear LED bike light set (twin pack) and super bright Headlights. Easy clip on, water resistant & three flash modes. Available in 5 colours. (Misc.)
These lights are incredibly inexpensive and it does the job.
I don't know how long it will last but I can't ask much from a 3 pound pair of lights.
I recommend it.