It is the super mini rechargeable hearing amplifier in the ear. It is for slight and moderate hearing loss people to improve voice. For the long using time, you no need change and buy battery frequency.Machine size/cm: 2*1.5*1.8Max Sound Output:125 ± 5dBVoltage:1.2VSound Gain:≥35dBTotal Harmonic Wave Distortion:≤5%Battery capacity/Mah:40Operation Current:≤3mAOperatoin current/mA:1.2Frequency Range:300-4000HzWorking time/H:33Input Noise:≤30dBCertification:CE,FDAAccessories:Chargeing base:1, Ear tip:6pcs, Gift box:1, Operation Manual:1, Adaptor:1, Cleaning tools:2Packing box Size:4.5*12*9Weight:155gHOW TO USESteps1：Connect the silicon tip to hearing AmplifierSteps 2:Turn the switch to "ON"PositionSteps 3:Plug the heading amplifier into your ear and adjust the volume as your likeIf you can't hear from the heading amplifier,please check the following stepsIf the power is switched on keeping method: 1:The heading amplifier shouding be kept in the room,Where is dry and well ventilated2. Where the relative humidity is less than 80% and there is no corrosive gas3.when you use ,you can chose your size earplug4.if it still can't hear,please contact with us,we are give you a new one or give you 100% refund
