Aika AG-7902 Finger Touch Wireless Hearing Aid Sound Enhancement Machine for Both Ear for up to 60% Hearing Loss Old Age People In The Ear Hearing Aid  (Black)

902 Mini BTE Hearing aid,Max Sound Output: 130dB ± 5dB,Max Sound Gain: 50dB ± 5dB,Harmonic Wave Distortion: ?5%,Frequency Range: 450~3500 hz,Equivalent Input Noise: ?30 dB,Battery: AG5 button battery (Without Battery),Working Voltage: D.C.1.5V,Working Current: ?4mA,Color: As the picture shows,Item Size: 4.6 x 3.8 x 0.9cm,Package Size: 9.4 x 7.2 x 3.2cm,Net Weight: 15g,Feature: Low-frequency noise reduction H file. Package included:1 x F-136 Hearing aid,3 x Earplug (different sizes),1 x User manual. Note:- Adjust volume to the minimum before wearing.Choose an earplug of slightly bigger size to avoid whistler.Increase volume gradually to avoid sudden increase in sound.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.Keep the ear plug clean.Remove the battery if you don't use it for long time.