Invisible Wireless Hearing Aids For Deafness Elderly Rechargeable In Ears First Aids Tools Mini Sound Amplifier CIC

Features * Helps to amplify sound up to 30x with low ​background noise. ​* Built-in battery for easy charging. No need to ​replace the battery. ​* Stand up to 8-10 hours continues use with fully ​charged. ​* Minimize noise with interchangeable earplugs.

SpecificationsMax. OSPL: ≤128 (+3dB) ​HFA. OSPL: 108 (±4dB) ​Max Full-on Gain: 28 (±5dB) ​Max Gain: 43 (±5dB) ​Equivalent Input Noise: ≤29dB+3dB ​THD: ≤7%+3% ​Frequency Range: 300Hz - 4000Hz ​Charging Time: 6-10H ​Working Time: 15-22H

Do not wear under the following conditions: ​* Ear pain and discomfort. ​* Acute or chronic dizziness. ​* Sudden unilateral hearing loss in the last 90 days ​* Trauma or visible congenital deformity on the ​ear. ​* Bone conduction threshold is 15dB or more ​higher than air conduction threshold ​* Have a history of sudden or rapidly progressive ​memory loss that occurred in the past 90 days

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.