This heard in hearing aid is designed for old people or people with hearing problems, suitable for those people who was hearing loss or patients. Low power consumption, high-fidelity, medical material, fine quality imported chip, invisibility fleshcolor surface will not incongruity in the crowd. User-oriented design make the hearing aid can perfect the ear. You can have a try. Features: This heard in hearing aid is designed for old people or people with hearing problems, suitable for those people who was hearing loss or patients. User-oriented design make the hearing aid can perfect the ear. Low power consumption, high-fidelity, medical material, fine quality imported chip, invisibility fleshcolor body will not incongruity in the crowd. This affordable hearing aid have volume control, can adjust the volume to fit your own needs and preferences. Powered by 2 * A10 battery, smaller, simpler, more conveient, more powerful and more stable. Use digit circuit, automatic noise dropping technology, natural HQ sound, provides you a wonderful experience. Ergonomic design ear canal simulator, will not feel pain even after long time wearing. Medical non-toxic material equipped with medical soft silica gel, will not harm your ear. Pull the upstright backguy, you can open the battery box, easy and convenient. Equipped with one screwdriver, adjust the sound volume. Equipped with 3 size earplugs and two black brush, easy using and easy washing. Also provide better technology in ray of hearing aid, to reduce electromagnetic interference. The ideal people to worry about hearing. NOTE: This "whistle" during use is caused by improperly wearing, please adjust the position of the hearing aid to make sure the earplug completely plugs the ear cavity without leaving a gap. Or you should change the large earplug. You need to plug the ear cavity completely to avoids whistle sound. Specifications: Name: Hearing Aid Kit Material: silica gel Color: fleshcolor The biggest way out: 125 + / - 3 db The lowest way out: 30 + / - 5 db The total harmonic distortion wave: 10% Frequency range: 200-3000 hz Noise: 32 db Modern horse: 5 Voltage: 1.5V Current: 3.5mA Battery Type: 1 * A10 battery Item size: 12 * 12 * 18 mm / 0.47 * 0.47 * 0.71in Item weight: 3g / 0.11oz Package size: 100 * 50 * 30mm / 3.94 * 1.97 * 1.18in Package weight: 46g / 1.62oz Package list: 1 * Hearing Aid Kit