Installation of HearingAid Elderly Invisible CIC Hearing Aid Deep Noise Reduction Digital Machine Intelligent Shell technology: ABS Hearing aid category: In ear type Volume adjustment: 1. Convenient button adjustment, 2. Multiple volume selection, 3. Low frequency compensation intelligent noise reduction system, identifies and distinguishes noise waves, changes the gain of the channel where the noise is located, making the normal speed more obvious. The background noise is so small that you cannot even carry the volume control. Every time you press it down 3dB, the maximum gain is 39dB, and the minimum gain value is 21dB. When at the minimum volume, the next press will change to the maximum volume comfort threshold control; Automatic gain control, protects hearing, no longer has to endure sudden loud noise Package: 1 pair