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Maihear has been dedicating its life to creating innovative and better personal sound hearing amplifiers to link the sound world. It’s our greatest happiness if we can bring you a brand new sound world. Personal Sound Voice Enhancer allows users to listen to the world around them with multiple functions. People can control the volume and voice output as they like so that they can hear comfortably. Package list: 2 hearing amplifier/ 1 Charging base/ 2 kinds of hearing tubes/ 3 different types of domes/ 1 cleaning wipes/ 1 cleaning brush/ 1 dry capsule/1 dry case/ 1 User Manual Function: * Magnetic contact charging * Built-in 25-30mAh Lithium Polymer battery * 2 Channels WDRC DSP * Intelligent identification of charging direction * Limited charging current protection system * Fast charging: Less than 3.5 hours for a full charge * Long use time: Up to 20 hours * Indicator light: Solid Blue light when charging, Solid Green light when fully charged Usage: Switch mode by turning the roller. Program 1 suits a quiet environment. Program 2 suits TV mode . Program 3 suits noisy environments . Program 4 suits outdoors.