Be safe with NiteRider's Stinger USB Taillight! This small, easy to install safety light has a powerful 25 lumen LED that's visible from a half mile away. There are three modes to choose from: high, low, and flash. It easily mounts to almost any seatpost with the included rubber strap. Plus, when the battery indicator show a low battery, you can charge it in under 2 hours from a computer's USB port!