I just got a new Aduro 168 lumen tail light and am really impressed for the price. Both for brightness and construction. It has six settings and USB rechargeable. On high today it lasted well over 2 hours and then I was back from my ride so not sure how long it would last if left on. I'm sure on medium or low settings it would last most of a day based on my other lights that I paid much more for and appear to be equivalent in comparison so far. Time will tell. Maybe it won't last long and then I'll end up disappointed, But for now, I'm impressed.