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EDUTHA Hearing Aids, Rechargeable Hearing Aids for Seniors & Adults with Noise Cancelling, Behind-The-Ear Hearing Amplifier Personal Sound Amplification Devices with Portable Charging Case, Rose Vivtone Clean Protein is also rigorouslyBrand: Edutha Features: Clear Sound & No WhistlingThe unique design of the hearing aid installs the speaker in the channel to avoid sound returning to the microphone, thus effectively preventing whistling. The built in noise reduction chip effectively handles background noise and whistle suppression to improve listening comfort and clarity, freeing you from noise troubles. This hearing aid is the best choice for mild to moderate hearing loss.