Compatibility with: N100-5 -N104/EVO/ABSOLUTE -N87 -N44/EVO -N40/FULL/-5 GT/-5. ESS is an exclusive presence and braking signalling indicator with a LED light installed in the back of the helmet. You will not find better integration: the ESS was designed and developed specifically to be assembled on compatible Nolan helmets. Installation is simple, fast and user-friendly. The helmet retains its original comfort. ESS is the first LED signalling system to be installed in the back of the helmet. You will not go unnoticed. All Nolangroup helmets pre-set for the N-Com system are type-approved with the communication system installed, consequently they comply with regulation ECE/ONU 22-05. Emergency Stop Signal function: signalling of sudden braking by means of a LED light with high intermittence. ESS system is unrelated to the braking system of the bike, as it analyses the acceleration sustained by the helmet independently. Stable rear light function: fixed LED lamp for visibility. Intermittent light function in case of poor visibility.