The usb rechargeable rapid x2 takes everything you love about the rapid x and doubles it surface emitting led strips wrapped in cateye lens technology now pump out 100 lumens up front and 50 lumens in the rear for unparalleled safety day or night the compact lightweight body securely mounts almost anywhere including round and aero seatposts seatstays handlebars and forks for ultimate versatility the optional spacer x allows the rapid x2 to mount to our standard flex tight bracket rear