Following the launch of NITRO and NITRO 16, Siemens has extended the NITRO family to include all shell sizes. Darren Ransley, Marketing Manager in the UK said, "The limited gain provided by custom products has traditionally kept them from being a viable option for people with severe hearing loss. With 70dB of gain, hearing care professionals can now offer these customers the benefits of a discreet but high performing device." All NITRO models feature automatic feedback cancellation, noise reduction and data logging – 55dB models can also be equipped with the C-Guar wax protection system. NITRO 16 models have the added benefits of DataLearning and SoundSmoothing.Improved phase cancellation reduces or eliminates the feedback previously experienced with other CICs at higher power levels.