SIEMENS TOUCHING High Performance Hearing Personal Sound Amplifier (Automatic Microphone Noise Reduction)
100% digital signal processing chip--Excellent digital output performance with low distortion, and low noise Automatic MNR (Microphone Noise Reduction)--Advanced feedback cancellation system--New robust design with stronger and humidity resistance exterior--Rocker volume control--Single easy to adjust NH trimmer--Button control with two functions ： Soft/Loud