1. This hearing aid is specially designed for the elderly or people with hearing problems, suitable for those people or patients with hearing loss. 2. Low power consumption, high fidelity, high quality chip. 3. With volume control function, the volume can be adjusted to meet your own needs and preferences. 4. Ergonomic earplug design, even if you wear it for a long time, you will not feel pain. 5. Specifications: - Power supply: AA battery x 1 (not included) - Voltage: DC1.5V - Sound output: 129db - Sound gain: 55dB max - Harmonic distortion: less than 5% - Frequency range: 450-3500Hz - Input noise: less than 30dB - Working current: less than 4mA
