USB-Charging
Built-in 350mAh Polymer Lithium battery comes with a USB cord that charges from your computer, wall charger, power bank or any other device with a USB port. After charging for 2-3 hours, the bike tail light can work for 15?48hours in different modes.
Waterproof
Water spray from any direction will not enter the light even in big rainning. All clearly visible for night no matter rain or fog.