Ride your bikes safely at night with this Waterproof Bike Rear Light. It is a LED tail light that will help you keep those riding behind you aware of your presence in the wee hours of the night when visibility is poor. The light is USB rechargeable and is a perfect one to fit underneath your seat post. The bright light it emits is good enough to notify other riders, thereby helping you keep up with the safety rules when you are bicycling at night. The sleek design blends with any modern bike layout and is a must have for all bicycle riders who go out for biking in the dark.