*Note: The test field strengths given are unmodulated carrier values.
Transportation and storage
Ambient temperature range: -10
℃
~40
℃
Relative temperature range
：
≤80%
Atmospheric pressure
：
86kPa ~ 106kPa
Normal operating conditions:
Environment temperature:-10
℃
~40
℃
Relative humidity: ≤80%
Atmospheric pressure
：
86kPa ~ 106kPa
nominal voltage: DC 3.7 V (+0.1/ -0.1 V)
A special note on howlers:
One of the most common problems that new users of hearing AIDS encounter for the first
time is "squealing", which is hearing aids emit loud noises, especially when the volume is
turned on higher. The noise comes from the earplugs that are not completely plugged, and
the ear canal cannot be closed. The hearing aid amplifies the leakage sound, which is
then amplified by the hearing aid to generate noise.
Technical description:
1. Classification of hearing aids:
a) According to the type of shock: Internal power equipment;
b) According to the degree of shock: Type B application equipment;
c) According to the degree of protection of harmful liquid: IPX0, conventional device ;
d) According to the degree of safety in the presence of flammable anesthetic gas mixed
with air or with oxygen or nitrogen oxide: Equipment not to be used in the presence of a
flammable mixture of anesthetic gas and air or a mixture of oxygen or nitrogen oxide
e) According to the operation mode: continuous operation
2. External link device
If the mains power the external equipment connected to the product, it must comply with
GB9706.1-2007
or equivalent safety standards.
