If you ride your e-bike at night, this tail light is an absolute must-have for safety. It's designed specifically for electric bikes with a voltage range from 6V all the way up to 60V, so it should work with pretty much any e-bike system out there. The 180-degree beam angle is seriously wide - meaning drivers can see you from multiple directions, not just directly behind you. Installation is straightforward - you can connect it directly to your bike's controller or straight to the battery. The waterproof connector is a nice touch that'll keep it working through rain and wet conditions. At about 4.1 x 1.4 x 0.6 inches and just 76 grams, it's compact enough to fit on any bike without being bulky. The plastic construction feels durable without adding much weight. Just a heads up - they might send either the new or old version randomly, but both work the same. For the price, it's cheap insurance to make sure you're visible and safe during those evening rides. Way better than those basic battery-powered lights that always seem to die when you need them most!