Review on ODAHIS Bike Taillights - High Lumens Bicycle LED Rear Light - Waterproof & Impact Resistant - User Adjustable Flash Speed - Professional Grade Quality by Srivatsan Oling

I mount it on the back of my bike, very bright. The beam angle is significantly smaller than the advertised 250 degrees. The brightest ray is at a narrow angle behind the bike, then the brightness decreases significantly to the side. Good for cars approaching from behind, but does the job. Identical to other Revain flashlights that are cheaper. I bought both to compare and they are identical in appearance, construction and brightness. Both are made in China.