Add rear light functionality & mount your PWR Rider or PWR Commuter to your helmet. PWR Red Cap gives you a 12 lumen narrow rear light beam for day & night visibility. Can be programmed with Knogs Modemaker app. Specification Peak brightness: 12 Lumens For use with: PWR Rider / Commuter. Include helmet mount (Also works with Go Pro). Whats in the pack: PWR Red Cap Helmet Mount & Adapter. Narrow beam for distance visibility. Water resistant. Programmable modes.