4 Digital Sound Processing Channels 20-bit Audio Processor For Crisp Clear Sound 8-band Graphic Equalizer Nano-tech Waterproofing Automatic Feedback Control 1 Environmental Adaptive Listening Mode 20% Smaller Than Game Ear Series I 50db Of Hearing Enhancement Adjustable Frequency Tuning--bass and treble Fine Tuning Toggle Volume Control Sound Activated Compression (sac) Low Battery Tone Indicator Noise Reducing Rating: 29db Requires #13 Battery Includes Walker's Field Carrying Pouch Beige