This heard in hearing a-ids is designed for those who got hearing problems, suitable for hearing loss or patients. Low power consumption, high-fidelity, fine quality chip, user-oriented design make the hearing a-id can perfect the ear. Features: 1.Designed for old people or people with hearing problems, suitable for helping hearing loss or patients. 2.Low power consumption, high-fidelity, fine quality chip. 3.Comes with volume control to fit your own needs and preferences. 4.Mini size and light weight makes it easy carrying and space-saving. 5.Use digit circuit, automatic noise reduction, high sensitivity, natural sound, provides you a comfortable experience. 6.Non-toxic material equipped with soft silica gel, will not harm your ear. 7.Equipped with 3 different size earplugs, ergonomic design, nice wearing feeling. Specifications: -Product name: Hearing Aid -Material: silica gel + ABS -Max sound output: 1255dB -Sound gain: 435dB -Total harmonicwave distortion: 20% -Equivalent input noise level:40dB -Frequency range: 200-7500Hz -Voltage: DC3V -Colour: As pictures -Battery: 2 * lithium battery, 1.5V, 140mAh (included) -Package size: about 125 * 95 * 40mm / 4.9 * 3.7 * 1.6inches(Length * Width * Height) -Package weight: about 54g / 1.9ounces Packing List: 1 * Sound Amplifier Host 3 * Ear Plug 4 * Cell 1 * Instruction