Review on Ascher USB Rechargeable Bike Light Set - Ultra Bright Front Headlight and Rear LED Bicycle Light with 650mah Lithium Battery - 4 Light Modes (Includes 2 USB Cables and 4 Straps) by Michael Custodio

These little lights are the best and do exactly what you need. Many reviews describe what they are and how to use them, so I'll address a few of the complaints I've read. Elastic bands (there are 4 in total) are made of just such rubber. So don't stretch them too much or too much or they will break. Simply attach one end to your headlight, wrap it around any pole on your bike and attach the other end to the plastic edge of the clip. Another complaint I read was that one of the plastic clips was broken. Again, do not over-tighten or over-tighten the clamp. You need to pull it out just enough to insert one end of the elastic. If you pull too hard it will break. After all, the materials used are mostly just a plastic case with LED lights inside. If they are dropped or mishandled, there is a chance they will break. At this price I didn't expect high quality materials. However, they work great. I usually set them to flash slowly as I find that gives the best visibility in traffic. If you drive at dusk or in the dark, they will definitely stand out. Since I've put them on, I've noticed that oncoming cars notice them and pull away a little earlier. I usually charge once a week, but it can take longer. Since a bike is basically nothing more than inner tubes, you can place them anywhere to provide versatility. Very happy with this purchase.