Feature:1. Clear sound quality, low power consumption, low distortion, can be used at home or on noisy streets.2. Ergonomic and compact body, beautiful styling, wears without weight bearing, more comfortable to wear.3. Foodgrade silicone earplugs, easy to remove and wear, skinfriendly and ecofriendly, no harm to ears.4. 30dB high sound gain, 1004000Hz frequency range, and the equivalent input noise is less than 28dB.5. Assist people with hearing impairment to hear sound, simple to operate and use, convenient to adjust the volume.Specification:Item Type: Hearing AidsMaterial: ABS + SiliconeOutput Power: 3.6mWMaximum Sound Output: 1304 decibelsSound Gain: 30 decibelsFrequency Range: 100--4000HzHarmonic Distortion: 6%Continuous Working Time: 15 hoursPower Supply Mode: Lithium battery (built-in)Battery Capacity: 40 mAhWorking Current: 3mASpeaker Impedance: 110 ohmsInstructions:2. Turn on the power and adjust the volume to get a clear sound.3. If you hear a whistle, please check whether the earplugs are plugged tightly. If it cant be inserted tightly, please replace the earplugs of other sizes.Package List:1 x Hearing Aid1 x USB Charging Cable1 x Brush1 x Plug1 x Charging Base1 x English Manual5 x EarplugsNote:1. It is forbidden to use for patients with otitis media or ear abscess.2. Do not use at high volume for a long time. Otherwise it will hurt your ears. If you feel unwell, stop using it.3. Please take care of the product at any time to prevent the earplugs and the radio hole from being blocked by foreign objects. This will affect the effect of the amplifier.4. Avoid electric shock and dropping the product. Do not store or use in a humid, high temperature environment5. Do not use this product in an explosive and dangerous environment.6. Don't leave this thing to children. It may hurt children or other people, and its own parts may be damaged.7.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.