Bakeey K-188 Mini Size Ear Hearing Aid Sound Amplifier Micro Wireless Hearing Aid

Specifications Max Sound Output 110dB 5dBMax Sound Gain 30 dB 5dBHarmonic Wave Distortion 10 Frequency Range 300 4000HzInput Noise ≤40 dBBattery A10Working Current ≤3mANote Adjust volume to the minimum before wearing Choose an earplug of slightly bigger size to avoid whistler Increase volume gradually to avoid sudden increase in sound If you hear a howling check the ear silica gel is appropriate and whether the size of plug is tight the appropriate choice of earplugs and plugged make sure no air leakage Keep the ear plug cleanRemove the battery if you don t use it for long time