USB Rechargeable Hearing Aids Ear Hearing Amplifier Adjustable Sound Amplifier Hearing Device for Elderly Seniors

Specification Max OSPL: ?129dB±3dB Max Sound Output: 117dB±4dB Max Sound Gain: 38dB±5dB Frequency range: 450Hz-3000Hz Total Harmonic Wave Distortion: ?10% Input noise: ?28dB Charging line current:1-2A Charging time: 4-6H(8H for the first charge) Available time: 40H (Depending on amplification power) "OFF"---Power off button "H"-----Low frequency compression mode(Indoor) "N"-----Normal usage mode(Outdoor) "1-4"---Sound volume Package included 1 x Hearing aid 3 x Earplug (Different sizes) 1 x Black Box 1 x USB charging cable without the charge head Kindly Remind 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. 6. Please use the matching charging cable to charge the product, otherwise it may damage the product. 7. If you need to use a replacement charging cable, please use the charging cable suitable for the product. If you use an inappropriate charging cable to charge the product, it will cause damage to the product.