4-channel automatic volume control (WDRC)
Hyper cardioid pickup pattern microphone
Double microphones
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 delay prompt tone
Magnetic catch charging
Booting Automatically out of the box,
Power off in the box




Peak OSPL90(dB SPL) | ≤107+3dB |
OSPL90-HFA(dB SPL) | 104±3dB |
Harmonic distortion | ≤3% |
Peak Gain(dB ) | 31±4dB |
HFA/FOG Gain(dB ) | 28±4dB |
Equivalent input noise(dB) | ≤30dB |
Frequency response range(Hz) | F1≤500Hz, F2≥4000Hz |
Battery drain | NA |
Warranty | 1 year |
Packing | 15.3x9.6x5.8cm |
Certificate | CE, FCC, ISO, ROHS |




