product description:
Specification: Max Sound Output:130+-5dB
Sound Gain:>=50dB
Total Harmonic Wave distortion:<= 5%
Frequency:300-4000 Hz
Input noise:<= 30dB
Working voltage:D.C.1.5V
Working Current: <=4mA
Battery size: Ag13
Note: 1.It is forbidden to used by those patients with tympanitis or ear pyogenesis.
2.Don t use it at high volume for long time. Otherwise it will injure your ear. If you feel uncomfortable, please stop using.
3.Please maintain the products all the time, avoid ear plug and sound collecting hole being blocked by foreign objects. It will affect the effect of sound amplifier.
4.Avoid shocking, falling the product. Don t keep or use it in environment of humid of high temperature.
5.Din t throw the scrapped battery as common rubbish, it should be handled by special equipment.
6.Please take out the battery if don t use it for a long time. Otherwise the components will be rotted by time. rotten liquid from battery. Please take out the battery if don t use it for a long time. Otherwise the components will be rotted by time. rotten liquid from battery.
7.Don t use the products in potential explosive or dangerous environment.
8.Keep the until away from the children. It will be injure him or others, or damage the unit.
Accessory: 2 x Ag13 battery
3 x ear tips
1 x storage box
1 x manual book
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