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Invisible Digital HePersonal Amplifiers 150 Hours Battery Smart Chip for Noise Eliminating Volume Ajustment Suitable for Adults and Seniors(Left & Right Ear) Amplifier,This digital hearing aid, easy to hide, soft skin color, smart chip digital noise elimination, comfortable to use, eaug silicone health, will not cause skin allergy, suitable for adults and the elderly, children, low power consumption, sufficient energy storage battery, can work for a long time, battery life of 150 hours. Multi frequency adjustment of sound required for noise reduction and amplification of smart chip: according to different frequencies of different scenes, it can automatically adapt to the surrounding environment, automatically maintain the normal sound level of 55 dB, and will not make harsh sound due to sudden noise. 4-channel noise reduction function with wide range volume control: even in the noisy environment such as theatre, church, conference and hotel, you can easily capture the sound you want to hear. Made of environmentally friendly resin. Anti sweat, anti shock, anti fall, comfortable to wear. Suitable for people with left and right ears, there are three different sizes of earplugs for all to use. If the eplug is not tight and leaks air, the sound will be amplified, leading to an annoying whistle. Please choose the right ear.