The PWR Red Cap is an attachment to add rear visibility when using Knog s PWR Rider /Commuter modular bike lights. Also included is a mount to securely attach lights or even a Go Pro camera to your helmet. Adds rear visibility to PWR Rider /Commuter lights Easily and securely attaches to your helmet Mount also works for Go Pro equipment The PWR Red Cap gives you a 12 lumen narrow rear light beam for day & night visibility. For added customisation the light can be programmed through Knog s Modemaker app. The helmet mount also works with Go Pro equipment.