Blitzu X1 USB Rechargeable LED Bike Tail Light 2re USB RECHARGEABLE BIKE LIGHT - Stop Wasting Your Money and Never Buy Batteries Again. The X1 bicycle tail light charges from your computer or any device with a USB port. This Bike Light Only takes 1.5 hours to fully charge. INDESTRUCTIBLY BUILT - Practical, Reliable, and Durable. Drop-tested from 2 meter, impact resistant and built to perform. Water resistant rated to IPX4 - Protected against splashing water from any angle.