4-channel automatic volume control (WDRC)
Middle-power output with low distortion
Adaptive feedback cancellation
Layered Noise Reduction
Automatically saving volume & mode
Multiple functions with one button
3 program modes(P1 Quiet Environment Mode, P2 Noise Reduction Mode, P3 Advanced Noise Reduction Mode)
Mode switch prompt tone
Volume change prompt tone
Low battery warning indicator
Booting Automatically out of box
Power off in the box






Peak OSPL90(dB SPL) | 107±3dB |
OSPL90-HFA(dB SPL) | 110±3dB |
Harmonic distortion | ≤3% |
Peak Gain(dB ) | 35±3dB |
HFA/FOG Gain(dB ) | 28±3dB |
Equivalent input noise(dB) | ≤32dB |
Frequency response range(Hz) | F1≤350Hz F2≥3500Hz |
Warranty | 1 year |
Packing | 15.3x9.6x5.8cm |
Certificate | CE, FCC, ISO, ROHS |





