TWS Mini Rechargeable Hearing Aid Digital Hearing Aids Adjustable Tone Sound Amplifier Portable Deaf Elderly Digital Hea

SpecificationMAX OSPL90≤120dB 3dBHarmonic Wave Distortion≤10 Frequency Range450 5000 HzSound gain≤36dB 5dBInput Noise≤29dB 3dBCharing boxInclude 300mAHFull charing about 3 hoursOK to hearing Amplifiers recharing about 4 timesHearing AmplifiersInclude 30mAHFull charing about 1 5 hoursWorking about 20 hoursThe cause of howling noise The internal amplifier and the microphone are close to each other of the hearing aid and the sound is continuously received and expanded so it has a certain possibility of produce howling after power Ways to avoid howling noise 1 Adjust volume to the minimum before wearing 2 Choose an earplug of slightly bigger size to avoid whistler 3 Increase volume gradually to avoid sudden increase in sound 4 If you hear a howling check the ear silica gel is appropriate and whether the size of plug is tight the appropriate choice of earplugs and plugged make sure no air leakage 5 Keep the ear plug clean Pcakage includedHost x1Charging compartment x1Earplugs x3Brush x1Manual x1USB data cable x1NoticeIf you need to use a replacement charger please use a charger suitable for the product If an inappropriate charger is used to charge the product it will cause damage to the product