Cygolite Hotshot 2-Watt USB Rechargeable Taillight with USB Cable and Charger Powerful 2 watt LED technology USB rechargeable Li-Ion battery 5 Flash Modes: Steady  Zoom  Triple  Single  Random with run times from 4.5 hours ~ 500 hours on a single charge OSP (On-Site Programmable) Smart technology to adjust flash speeds Includes tail light with integrated clothing clip, seat post mount USB cable and wall charger