DIGITAL HEARING AID--Our CHUXIN GREAT ITE hearing aids are supercars among hearing aids. This ITE hearing aid uses a 130nm all-digital signal processing chip to quickly complete voice processing. Noise reduction through frequency division of 13 frequency bands, no annoying white noise. The omnidirectional microphone brings you a high-fidelity sound experience..ADAPTIVE FEEDBACK SUPPRESSION + WDRC--Equipped with the second-generation adaptive feedback cut-off system, instantaneous strong sound processing, high-speed suppression of howling, and protection of hearing from secondary damage. We use Wide Dynamic Range Compression (WDRC) technology from advanced hearing aids to limit the sound to the standard hearing range, making the sound more comfortable to hear..HEARING AIDS WITH BLUETOOTH APP--Firstly, you need to download the HA Fit app and open it. Secondly, turn on the Bluetooth function of your phone, search for “Ballet”, and click Connect. Finally, open the app to set the left and right ears, and you can choose the corresponding frequency band according to your own situation. Be careful not to adjust the frequency band value to 0, otherwise you won't hear the sound..SAFE AND RECHARGEABLE--Our hearing aids are equipped with a type-c charging cable, which is sufficient for 10 hours of use after 2 hours of charging. It can be used for 4 hours in Bluetooth mode.The charging box is fully charged and automatically stops, effectively protecting the lithium battery. When the battery is low, it will beep. High-capacity lithium batteries can normally be used for 5-10 years, which will save you the cost of buying batteries and the trouble of installing batteries..EXCLUSIVE CUSTOMER SERVICE--Enjoy peace of mind with our exclusive customer service. No matter if you encounter any problems with your hearing aids at any time, you can contact us at any time. As long as you contact us, we will provide a solution within 24 hours. Plus, as a responsible Amazon hearing aids seller, we offer a 30-day free return or exchange. We sincerely hope that this hearing aid can satisfy you, thank you!