Nicely Neat USB Rechargeable Ultra Bright LED Bicycle Tail Light, 150T Extremely visible 160-degree ultra bright red LED tail light Water resistant, impact resistant and USB rechargeable (cable included); fully charges in just 2 hours from any USB port; built to last Can be mounted vertically or horizontally; easily fits onto seat posts, handlebars, helmets, and backpacks Light has 6 modes; standard (6 hours runtime), high (2 hours 45 minutes runtime) and overdrive (1 hour 40 minutes runtime); brightness levels include 50% flashing (5 hours 10 minutes runtime), 100% flashing (3 hours runtime) and strobe flashing (2 hours 50 minutes runtime) 30-day return policy; we are confident this is the best bike tail light out there; if you are not happy with your purchase for any reason, contact us for a money back refund within 30 days