• Intelligent Volume Record learning Function. Intelligent Volume Record learning facilitates Polaris to meet various volume levels in different environments . User is free from frequent volume adjustment. • Intelligent Real-Time Spectrum Analysis Presentation System Real-time display by software helps audiologist get exact fitting for users. • Built-in Audiometer Built-in Audiometer function is used to test the user's hearing loss status which can be a good reference for user. • Dual Dynamic Range Compression DDRC can enhance more compression of loud sound in dynamic range on the basis of WDRC.There are two input CK points and one output CK point on each channel, we can adjust CK point to change compression level of sound, to make the sound more clearly and provide comfortable hearing. People can hear abundant speech information and enjoy a comfortable listening.