CatEye's Rapid X2 is a tiny, lightweight, all weather rear light for nighttime visibility. Its 50-lumen high-power LED lasts for up to 30 hours, features six modes, and automatically switches to flashing when you're at 20% power to provide an additional hour of light. A USB charger lets you refresh the rechargeable battery in two hours. You'll love the Rapid's side visibility when you're riding and its easy installation and removal when it needs recharged.
The CatEye Rapid X2 is a great choice for mounting on the flag pole on a recumbent bike or trike, too.