Also, they are now available with or without SIDETONE. Sidetone is a function which allows you to hear yourself through the headset speakers when opening transmission or just when speaking through the microphone.NVolo helmets are very compact in size and weight due to their elaborate construction using several composite fibers: carbon fiber, carbon-kevlar fiber and fiber glass; we apply it in several external finishes by reversing the order of the layers, by color painting or by the Water Transfer Printing process.This specific shell model called CARBON HIGH VIS, has been painted with high visibility fluorescent colors and a clear coating.We can build your helmet with different headsets models and NVolo accessories, according to the pilot’s needs and preferences.Price includes: Carbon High Vis helmet, headset for 2 meter amateur radio band (VHF) or aviation airband (UHF) radios, BlueTooth, cable (pigtail), carrying bag, manual and a 2 YEAR WARRANTY! You may add a long or short visor, goggles, gel earcup ringoo audio connection. See the Visors & Goggles and Accessories sections for additions to your helmet order.NOTE: HELMET CERTIFICATION INCLUDES HEADSET (NOISE CANCELLING or WITH ELECTRONICS). HELMET CANNOT BE SOLD SEPARATELY.