Specifications Hign-concerned Chemical:None Origin:China Mainland Brand Name:DOCTODD Wireless hearing aids with digital display and charging case Description: 1. Peak gain (dB): 108dB3dB, suitable for Suitable for mild to moderate hearing loss (see hearing loss chart) 2. Digital display rechargeable box charging: Your hearing aid can be charged with a detachable charging box. And there is a battery on the charging box to light up the display. (You need to charge the detachable charging box first.) It is easy to carry, saving you the trouble of constantly buying button batteries. You can intuitively see the remaining power of the earphones and the charging box, which is convenient for you to charge in advance. 3. Charging time: 2-3 hours of charging, can work for 30 hours, (faster charging than other charging boxes on the market, longer working time) The indicator light is red when charging. It goes out when fully charged. 4. Designed for people with hearing impairment, it fits the ear canal better. You will not feel pain even if you wear it for a long time. 5. If the earmuffs are not fully inserted into the ear canal or the earmuffs leak, it will cause annoying whistling. We provide 3 different sizes of earplugs to reduce whistling and noise. Please Noted Causes of whistling/noise: In order to make a small hearing aid, the internal amplifier and microphone are placed close to each other. The sound is continuously received and expanded, so there is a certain possibility of whistling after power-on. At present, small hearing aids and high-power hearing aids on the market are difficult to avoid whistling, and only fully functional digital hearing aids can avoid whistling. Ways to avoid whistling/noise: 1. When the power is large (the amplified sound is large), it is more likely to produce howling. Therefore, gradually increasing the bass volume can effectively prevent howling. 2. When the ear canal is completely closed, there is no whistling sound. So after cleaning the ear canal, put on the hearing aid, test the earplugs from large to small, find the most suitable earplugs, and ensure that there is no air leakage. 3. After the hearing aid enters the ear canal, it is recommended to push the hearing aid with your fingers and hold it for 1-2 seconds, then release it to fully extend the earphone. 4. In the shutdown state,turn the volume of the hearing aid to the lowest level, then insert it into the ear. Make sure that the earbud completely fills the ear. Then turn on the power button and slowly increase the volume to a suitable volume. 5. Users who have not heard the sound for a long time may cause hearing loss due to the long-term failure to hear the sound, resulting in the hearing aid still unable to hear the sound. Please persevere, continue to stimulate the growth of the hearing nerve, and you will hear after a while. If you are not sure whether your hearing aid is working properly, you can try the product on a person with normal hearing. 6. Please pay attention to cleaning the ear canal and keep the earplugs clean. In addition:If you do not know how to use it or there is a problem with your hearing aid, please do not rush to leave a negative review and contact us. Thank you. Product parameters: Peak 0SPL 90(dB SPL): 108 HAF OSPL 90(dB SPL): 103 Peak gain(dB): 33 HAF/FOG gain(dB): 27dB Frequency range(Hz): 300-5000Hz Equivalent input noise(dB): 30dB Total harmonic distortion: 10% Voltage: D.C.3.7V Current: 1.2mA Charging time(H): 2~3 Working time per charge(H): 30h Battery: Built-in lithium battery Current: 1.2mA Dimensions: 322226.5 mm Specifications: Product name: ITE hearing aid Color: White Package includes: Hearing aid: 2 pcs Ear tips: 6 pcs Cleaning brush: 1 pc TYPE-C charging cable: 1 pc Charging plug: 1 pc Manuals: 1 pc Charging box: 1 pc Note: The product package does not include a plug. The product itself uses USB charging. Tips: 1. Clean the ear canal before use. 2. If you are not using the hearing aid, turn it off. 3. Charge it regularly to avoid the device running out of power.