This hearing device is designed compatible with old people or people with hearing problems, suitable compatible with those people who was hearing loss or patients. Low power consumption, high-fidelity, fine quality chip, invisibility fleshcolor surface will not incongruity in the crowd. User-oriented design make the hearing device can perfect the ear. You can have a try. Features: This heard in hearing device is designed compatible with old people or people with hearing problems, suitable compatible with those people who was hearing loss or patients. User-oriented design make the hearing device can perfect the ear. Low power consumption, high-fidelity, fine quality chip, with soft silica gel, does not harm to your ear. This afcompatible withdable hearing device have volumes control, can adjust the volumes to fit your own needs and preferences. Powered by built-in battery, smaller, simpler, more convenient, more powerful and more stable. Use digit circuit, automatic noise dropping technology, natural sound, provides you a comcompatible withtable experience. Ergonomic earplugs design, will not feel pain even after long time wearing. Note: To avoids being swallowed by children accidently, keep small parts out of children's reach. Specifications: Name: Hearing Device Material: plastics Type: black-right ear, black-left ear(optional) Battery: 1 * A10 battery, 1.4V, 1.2mA (included) Max sound out put: 1223dB Sound gain: 28dB2dB Total harmonic-wave distortion: 3% Frequency-range: 300-4800MHz Input noise: 26dB Package size: 135 * 65 * 25mm / 5.31 * 2.56 * 0.98in Package weight: 45g / 1.59ounce Packing List: 1 * Hearing Device 3 * Earplug 1 * A10 Battery 1 * Vent Rod 1 * Guideline