Frequency Range:<br />Set a press button for adjusting the frequency, include low, middle, high and wide totale 4 frequency for you to choice, it will display the middle frequency when you power on.<br />Frequency Response:<br />300Hz-10kHz Low power consumption and long life, use of rechargeable Lithium Battery.<br />FM Radio:<br />It support FM radio function, you can enjoy the radio from FM broadcast freely, it only can use of hearing aid when you turn off radio.<br />Volume Control:<br />Total 8 grade volume adjustment, from 1-7, 0 means power off, 7 means maximum volume.<br />Charging Time: <br />2 hours(8 hours for the first time charge). It can work continuously for about 30 hours after it is full of charge.<br /><br />Description:<br />Model: E-8<br />Max Sound Output: 127&amp;plusmn;4 dB<br />Max Sound Gain: 52dB &amp;plusmn; 5dB<br />Harmonic Wave Distortion: &amp;le;5%S<br />Input Noise: &amp;le;30dB<br />Low Frequency: 580Hz~~2.8KHz  <br />Middle Frequency: 700Hz~~4.8KHz   <br />High Frequency: 780Hz~~7.8KHz<br />Wide Frequency: 910Hz~~10.5KHz                               <br />Working Voltage: DC 5V&amp;plusmn;0.5V                               <br />Working Current: &amp;le;2.5mA  <br />Hearing Aid Net Weight: 9g<br />Hearing Aid Size: About 4 x 3.2 x 1.2cm<br />Package Size: About 16*10*4.3cm<br />Package Weight: About 206g<br />Battery: Lithium Battery          <br />Color: As shown in the picture<br />Adapter: We will send you an adapter (this is just plug adapter,not the transformer's adapter) according to your living country.<br /><br />Package Include:<br />1 x E-8 Hearing Aid  <br />1 x Case<br />1 x Charger (110-240v.)<br />6 x Earplugs (different size)<br />1 x English Manual<br /><br />NOTE:<br />1, If you hear the whistling sound, please make sure if you put the earplug tightly, or if you use a appropriate size earplug.<br />2, Please take out the battery orS turn off the hearing aid when you stop to use it.<br />3, This product is not waterproof.<br />4, If water enter the sound amplifier, remove the battery and place the sound amplifier in a warm place to dry.<br />5, Sound Amplifier is not a hearing aid for those with impaired hearing. If you have impaired hearing, please consult your doctor.