>>828412>>828619https://www.amazon.com/Planet-Bike-Blinky-eXtreme-Bicycle/dp/B000KBEH1W/ref=pd_sim_468_2?ie=UTF8&dpID=41nlwbFpjdL&dpSrc=sims&preST=_AC_UL160_SR96%2C160_&psc=1&refRID=C37DM4AD507TP41M89MFSpend a little more and get a light that will last you years instead of weeks. This is the Honda Civic of rear lights- tons of people have them and they work well and are cheap.
IMO rear/tail light is the most important safety gear, above helmets for any situation involving cars. If you're riding safely and slowly, the need for a helmet diminishes. Ride and prepare as if you are invisible to cars.