The PRO-27 is a breakthrough in high-noise filtering giving you an almost flat reduction of around 23dB through the low and mid range frequencies so that you maintain situation awareness and your ability to communicate but can still be comfortable in very loud environments. In the higher frequencies the PRO-27 gives you a stark jump in protection offering up to 35dB where you need it most so you can carry on working or enjoying your passion in safety. With an average attenuation of 27dB the PRO-27 can increase your safe exposure time by up to 9 times (B) The next generation of filter design (/B) The PRO filter series has been designed anew with the wearer in mind. For starters, it’s smaller than many competing filters which means it can fit into smaller ears without any protrusion which is great for both comfort and aesthetics because it will always fit snugly underneath a helmet or other headwear. The filters are also removable so you can clean and maintain your earmoulds and your filters to give you the maximum life and the best value for money from your plugs. In addition, the PRO series are water resistant so they can be used outside or in high moisture environments and can withstand perspiration without it damaging the filter membrane. When riding, flying or driving, good, clear reception of an audio signal is generally difficult due to the ambient noise levels. The use of hearing protection can safeguard the ears from noise induced hearing damage but does little to improve the wearer’s ability to hear clear sound. Turning the volume up to high levels will allow the user to hear but also increase the possibility of hearing damage. Utilising the knowledge developed supplying Motor Grand Prix, Formula 1, Word Rally and Touring car teams, duocom™ was developed over a two-year period in conjunction with the Metropolitan Police and The National Crime Squad. Pro 27™ incorporates the specially developed Biopact hearing protection filters into custom moulds together with special mini transducers. Pro 27™ Moulds is tailored to the individual from impressions taken of the users ears and is manufactured in soft durable silicone allowing their use over long periods of time. Pro 27™ is independently tested to ISO4689 and DIN17460. They conform to European Normalisation EN352-2 standards laid down for hearing protection and carry the CE 121 marking.