Herrmans Dynamo Taillights. Features: Durable dynamo powered lights that are instantly noticeable, and work with any 6-volt, 3-watt dynamo hub LED lights gives a strong, steady output, and have built-in reflectors for extra visibility H-One S, H-Track and H-Trace are equipped with the Standlight function which keeps the light lit when stopped for up to 3 minutes Lights fulfill a number of European road traffic regulations Specifications: Model: H-Trace Package: Rear Output: 2 LEDs Color: Black/red