This is F-13 Fashion Design Cassette Hearing Aid. Unique design and good quality. The Hearing Aids is easy to use and can filters out some unwanted noise caused by airflow or wind. Good choice for you!                                    Features            This hearing aid is compact， convenient to take along<br>The hearing aid is specially designed for moderate deafness patients<br>With little noise and less distortion<br>This hearing aid is made of high quality material， durable enough<br>The hearing aid is easy to operate even without prior exprience<br>                                                            Specifications            Frequency range    300 ~ 4000Hz    <br>Maximum acoustic gain    30 ~ 80dB    <br>Total harmonic wave distortion    芒鈥奥?10%    <br>Signal to noise ratio    芒鈥奥?30dB    <br>Maximum acoustic output saturation    128db 脗卤5db    <br>Voltage    DC 1.5V    <br>Current    芒鈥奥?4mA    <br>                                                            Package Includes            1 x F-13 Fashion Design Cassette Hearing Aids<br>1 x Earplug<br>1 x Ear line<br>1 x AA battery<br>2 x Manual<br>1 x Warranty Card<br>