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• Rechargeable Hearing Aid Mini Invisible Digital Sound Amplifier for Deafness Elderly Wireless Aids Mild to Moderate Hearing Loss Audifonos ●If the earmuffs aren't completely inserted into the ear canal or the air leakage of the earmuffs will trigger electric noise, please don&;t worry,this is the smart chip is suppressing howling, just update the larger earplugs off or lower the quantity before putting the instrument on your ear Securely role the tool into your ear Once the hearing aid is correctly seated on your ear,the howling will commonly give up Product Features: * Mini size--Invisible to put on * Easy to operate for elderly *Digital chips, Noise reduction * Rechargeable--no should replace battery * Around 25 Hours to use after solely charged Product parameters: Size: 21 Working voltage: DC 3 +5%, -10% Working current: ≤ 1 Frequency response: 300-5000 Hz Equivalent Input Noise: ≤29dB, +3dB Maximum Saturation Acoustic Output: ≤128dB, +3dB Question: Why is there a howling, whistling, or sharp sound? Answer: Whistling occurs when the hearing relief and the ear canal are not permanently matched Sounds from the receiver are duplicated at the microphone and the sounds sort a loop, that could be constantly amplified and bring about a whistling noise Please don&;t worry,The folloring methods may also help lower the prevalence of suggestions whistle: 1 the quantity off or lower the volume before inserting the tool on your ear 2 role the software into your ear Once the hearing relief is correctly seated on your ear,the whistling will commonly quit three the ear canal of wax or particles your ear with help 4 the ear piece or tubing a brand new one or a different size one yes the tubing is not damaged or torn

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