Review on 🚴 Cygolite Hotshot – Powerful 2 Watt Bike Taillight with 6 Modes – Adjustable Flash Speed – Compact & Water Resistant – USB Rechargeable – Ideal for Busy Roads by Erik Snyder

I've had it since 2013. I only need it in winter (summer time). This light is very bright and USB charging is very convenient. Keep the USB charge port covered (with the rubber cover provided) if it corrodes it will make charging very difficult as the electrical connection will not be made. This will be my 6th winter of using it and while it's been on the shelf for 3/4 years I've charged it up and it works great. After 4 years, I managed to tear off the USB rubber cover and the company promptly sent me a new one. I couldn't resist the temptation to take it apart and it looks very well made from the inside. I've used it on both my daily commuter bike and my gravel bike (which gets pretty heavy use). I don't ride in the rain (much) so can't comment on the waterproofing, but inside it seems built to resist water. I would say the USB charging feature makes this very convenient, I can easily charge it from my laptop at work.