About this item No battery replacement required; the charging case fully charges in just 60 minutes. With the charging case, you can charge your hearing aids anytime, anywhere. Five Volume Levels: Enjoy five volume levels (20%, 40%, 60%, 80%, 100%). Double-tap the left or right side to adjust the hearing aid volume. The volume cycles from low to high, a total of 5 levels. You will hear a "beep" when the volume reaches maximum. Three Different Listening Modes: Press and hold for 3 seconds (Normal mode, one beep), (Noise Cancelling mode, two beeps), (Outdoor mode, three beeps). .
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