Magicshine SEEMEE 30TL V2.0 Rear Light (30 Lumens)Features Maximum 30 lumens, 230 of light, and visible from up to 800 meters Ambient light sensor automatically adjusts brightness to the environment Low power mode to extend runtime efficiently High transparency lens and lighting strap provide more uniform light Translucent body design with superior side visibility Memory function and multi modes to satisfy various riding scenarios Feathery 0. 78 oz, and exquisite housing with IPX6 waterproof rate USB