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How to reduce feedback/whistling for this hearing amplifier
people with all height would find out a comfortable using experience
so you don’t need to find a plug to charge it when it is working
Beam Angle：180°
Please connect the device to the direct USB port on your computer
Hearing Aids for Seniors, Rechargeable Personal Hearing Amplifier Devices ITE Charging Case Blood Glucose Meter How to reduce feedback/whistling forProduct details Specifications: Max sound output: 125+ 3db Sound gain: >= 28db+ 5db Total harmonic wave distortion: <= 3% Frequency range: 300 3500mhz Input noise: <=32db Voltage: d. c. 1. 5v Current: <=2ma Full charging: 6 hours Working time: 16 hours Built in 25mah recharging battery for hearing aid unit Charging box without built in battery needs USB charging cable Material: ABS Description: A hearing instrument is a kind of electronic device which
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