Rechargeable Hearing Aid Digital Hearing Aids for Elderly In Ear Sound Amplifier Mini Invisible Wireless Headphones With Adjustment Tools For Deafness

▶Product feature: 1. 5 Volume Levels----Press the Button to Adjust Volume 2. 16 Channels--Digital Hearing Aids bring you better sound quality 3. Advanced Chips--Noise Reduction

▶Technical Specification： 1.MAX OSPL 90(dB SPL):1112 2.HFA OSPL90(dB SPL):107 3.Peak Gain(dB):35.8 4.HFA FOG(dB):30.1 5.Frequency Range:F1s200Hz~F2z4700Hz 6.THD at 500Hz:0.6%

THD at 800Hz:0.5%

THD at 1600Hz:0.3% 7.Eq.Input Noise Level(dB):22.7 8.Battery Current Drain(mA):1.18 9.Attack Time(ms):6 10.Release Time(ms):62

▶Prompt: There are Whistle as you put the battery into the hearing aid .Please donot worry .because the air presure will make Whistle. ​1.Please adjust lower volume . ​2.Choose the suitable ear plug ​3.Make sure if you put the earplug tightly,sound leak will make the Whistle.