The Lezyne Femto Drive light is a compact, bright safety light. The lens is made from high-quality material and also serves as the on/off switch, allowing you to switch between a flashing mode and a steady light mode. The CNC-machined housing makes the light durable and weather-resistant. The composite matrix end cap can be unscrewed to replace the two CR2032 button cells. The light can be attached to many seat posts and shines directly backward thanks to its angled rear design. The composite matrix holder and multi-position silicone strap ensure tool-free installation.