Welcome to our store! 1Effectively amplify the sound of the surrounding environment, plus and minus buttons to adjust the sound and frequency. 2With advanced hearing aid function, multiple noise reduction, reject current sound. 3Can be recharged to use, energy saving, environmental protection, recycling with high performance. 4Smart chip, builtin 110mAh Liion battery, with charging circuit protection function. 5Sports sound amplifier, hanging neck to carry with you, allowing you to experience clearer sound. Item Type:Neckband Hearing Aids Material: ABS Color: As Picture Shown Weight: Approx. 125.0g/4.4oz Model: D-8800 OSPL90max: 108dB OSPL90HFA: 106dB FOG50HFA: 35dB EQ Input Noise: 25dB Frequency Range: 300Hz-4200Hz Rated Working Voltage: 3.7V Rated Working Current: 1.7MA Battery: Built-in Rechargeable Li-ion Battery, 3.7V/110mah Charging Voltage: DC4.75-5.25V Charging Time: 2 hours Maximum Saturation Sound Pressure Level: 129dB+3dB Output Sound Pressure Level (high frequency average value): 120dB4dB Full Range Sound Gain (high frequency average value): 40dB5dB Total Harmonic Distortion: the maximum actual measured value should not exceed 10% Equivalent Input Noise Level: the actual measured value should be 32dB Ambient Temperature: 5-40 Relative Humidity: 80% How to use: Long press the power button to start, effectively amplify the sound of the surrounding environment, plus and minus buttons to adjust the sound and frequency. With advanced hearing aid function, it completely solves the noise. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1 x Neckband Hearing Aids 1 x Manual 1 x Charging Cable 4 x Earphone Cap (Customer Satisfaction) - is our priority. If you notice any problems with the products after receiving the goods, such as damaged goods or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory after-sale service. Thanks for seeing me, I hope I can help you. Good life to you.