The topeak combo aero usb light set is a great set to own if you are commuting to and from work a great value combination which includes a whitelight aero front light and a redlight aero rear light the lights have different features that make the light flash and blink to make sure people are aware of your position the 3 led lights in each light are super bright and are powered by a 37v 220 mah lithium usb rechargeable battery the lights have a great battery life with 105 hours in constant