Magic Strobes RSG module is manufactured by Custom Dynamics to be compatible with certain Harley-Davidson motorcycles. Plug and play installation on 2014-2020 Street Glide, Street Glide Special, Road Glide, Road Glide Special, Road King Special applies brake flash/strobe patterns to Custom Dynamics Rear 1157 LED bullet style run, brake, and turn signals. Requires the use of Custom Dynamics LEDs (or any low power current draw LEDs) in the rear. The use of Incandescent or High-Power LEDs (greater than 84 Watts or 6 Amps) will cause the unit to fail and void warranty. This unit is not compatible with Harley-Davidson aftermarket dual intensity Tri-Bar. This unit is ONLY compatible with USA model Harley-Davidson motorcycles, and does not fit HDI or Canadian Harley-Davidson motorcycles.