Designed to help the hearing-impaired to raise the audition， hear voice and do barrier-free communication with others， our Mini In-ear Hearing Aid Sound Amplifier K83 will surely brighten the life of those who have poor hearing. With full digital circuitry for natural， clear sound and great listening comfort， our hearing aid could improve sensitivity and reduce unwanted background noise. It also offers adjustable volume control and clear sound. Compact and lightweight， the hearing aid will not add any burden which results in some discomfort to ears. Wise try!                                    Features            Full digital circuitry for natural， clear sound and great listening comfortLow power consumption for long time useAdjustable volume control and clear soundCompact and lightweight， add little burden to earsReduce unwanted background noiseSuper mini， invisible and comfortable to wear                                                            Specifications            Material    Plastic    <br>Dimensions    (0.9 x 0.59 x 0.79) " / (2.3 x 1.5 x 2.0) cm (L x W x H)    <br>Color    Brown    <br>Weight    0.14 oz / 4.0 g    <br>Model    K83    <br>Max Sound Output    110 ± 5 dB    <br>Sound Gain    ≥30dB    <br>Total Harmonic Wave Distortion    ≤ 10%    <br>Frequency Range    300Hz ~4000 Hz    <br>Input Noise    ≤ 40 dB    <br>Voltage    d.c. 1.5 V    <br>Current    ≤ 4 mA    <br>                                                            Package Includes            1 x Hearing Aids3 x Earplugs(Different Sizes)4 x AG3 Electronics1 x Operation Manual1 x Box