Hi, selling Brand New Bicycle/E-Scooter Rear Light For Safety Use. You maybe cycling in the very early morning before the sun rise. Is better to place 1 behind your Bicycle/E-Scooter to let other road user to notice you. Weight: 20grams only. Size: 6cmX2.6cmX2cm. 4 Function modes. Total 4 LED Light. Using 2x CR2032 Battery. Waterproof and Weatherproof.