Gmax LED Brake Light Kit Models FF-98/MD-01/OF-77Manufacturer: Gmax Helmets fits all size helmet models FF 98, MD 01 and OF 77 from XS to 3XL The LED wireless brake light kit offers a visual enhancement to the rear of your helmet when the braking circuit is engaged on your motorcycle or snowmobile Wireless design Multifunction LED displays the brake function or four other operating modes. Solid on, Fast blink all, Fast blink right & left, Wig Wag left to right. No modification needed to your GMAX