J20 is non-programmable instantfitCIC hearing aid. Based on integrated signal processing, J20 can provide your hearing clear and comfortable. Audiological Features Low Equivalent Input Noise Super Clear Sound Low Frequency Cut Filter Functional Features Volume Control Mode:Rotated VC0~25Db Colors available：Red, Blue Note 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. If it still does not work, please check the chat window leave me a message. 5.Keep the ear plug clean. 6.Remove the battery if you don't use it for long time. 、

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