Soonfire FD39 USB Rechargeable Bright Bike Light
[FD39]

This flashlight is great! It's easy to use and works really well. It charges via micro-USB, which is included, but not the wall adapter. You can use any of your own. There are multiple settings that you can choose from with a small blue button on the side. It's been very reliable, and the charge lasts a good amount of time. I'm very happy with it and highly recommend it!