This advanced system integrates radar technology into our industry-leading LED front and rear bike light set. Riders can now receive audio and visual alerts through multiple devices:Lezyne Radar Ally smartphone appCompatible GPS bike computers, orDirectly via the React Drive front bike lightThe Radar Drive pairs with the React Drive to complete the Radar React System. Rear-facing LED indicators and audible alerts are custom-built into the React Drive, providing real-time notifications of rear-approaching vehiclesno smartphone or third-party device required.This all-in-one system delivers TOTAL VISIBILITY: radar-based vehicle detection, disruptive daytime flash patterns, and up to 1200 lumens up front for effective night riding.All of this is backed by our exceptional R&D, in-house manufacturing, and premium features like IPX7 waterproofing and USB-C charging.Welcome to the future of bicycle visibility: activate your Cycling Sixth Sense.Note: A smartphone is required for the initial pa