1pair Invisible In-Ear Hearing Aid Sound Amplifier For The Elderly And Hearing Impaired 1. This hearing aid is designed for the elderly or people with hearing problems, suitable for those with hearing loss or patients. 2. Low power consumption, high fidelity, high-quality chips, invisible flesh-colored surface will not appear out of place in the crowd. 3. With volume control function, you can adjust the volume to meet your own needs and preferences. 4. Built-in battery power supply, smaller, simpler, more convenient, more powerful and more stable. 5. Adopt digital circuit, automatic noise reduction technology, natural sound, bring you a comfortable experience. 6. Ergonomic earplug design, no pain even if worn for a long time. Specifications: 1. Material: Plastic 2. Battery: 1 A10 battery, 1.4V, 1.2mA 3. Sound output MAX: 122+-3dB 4. Sound gain: greater than or equal to 28dB+-2dB 5. Total harmonic distortion: less than or equal to 3% 6. Frequency range: 300-4800MHz 7. Input noise: less than or equal to 26dB Note: To prevent accidental swallowing by children, keep small parts out of reach of children.