Designed to help the hearing-impaired to raise the audition， hear voice and do barrier-free communication with others， our Mini Handy Useful In-ear Hearing Aid Sound Amplifier K80 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 comfort<br> Low power consumption for long time use<br> Adjustable volume control and clear sound<br> Compact and lightweight， add little burden to ears<br> Reduce unwanted background noise<br> Super mini， invisible and comfortable to wear <br>                                                            Specifications             Material     Plastic    <br> Dimensions     (0.9 x 0.75 x 0.55) " / (2.3 x 1.9 x 1.4) cm (L x W x H)    <br> Color     Brown    <br> Weight     0.10 oz / 3.0 g    <br> Model     K80    <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 Aids<br>3 x Earplugs(Different Sizes)<br>2 x Electronics<br>1 x Operation Manual<br>1 x Box<br>