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• Invisible Hearing Aids Sound Amplifier for elderly Ear Hearing Amplifier Adjustable Tone Sound Amplifier audifonos para sordera Hearing Device Advantage: intelligent Noise Reduction light-weight & Small Designed Comfortable Listening Trimmer VCe: vc becomes 0-max listening program Easy to Operate,Easy to Use Technical Specification: 1 OSPL（90dB SPL）111 2 OSPL90(dB SPL）107 three Gain（dB）39 four FOG（dB）34 five Range 6≤200Hz－F2≥7200Hz 7 at 500Hz 2% eight at 800Hz 1% 9 at 1600Hz 0% 10 Noise Level（dB）23 eleven Current Drain(mA) 1 Note: 1 volume to the minimal before wearing; 2 an earplug of barely larger size to avoid whistler; 3 quantity gradually to avoid unexpected broaden in sound; four you pay attention a howling, test the ear (silica gel) is acceptable and whether the scale of plug is tight, the appropriate selection of earplugs and plugged, ensure no air leakage; 5 the ear plug clean; 6 the battery when you don&;t use it for very long time

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