The power for the tail light is simply tapped from the main battery by fitting in the IP67 waterproof plug before attaching the headlight. Despite the great brightness of the tail light, this only diverts a minimal amount of energy and only reduces the burn time of the headlight by a few minutes. The tail light can be controlled by the standard Supernova headlight unit. You can choose between constant light-on or flashing mode. With its 50 inch (120cm) cable, it can be used on every frame and with practically every positioning of the battery. The tail light can be securely fixed to any seat post.