Powertone F-138 In-Ear Hearing Aid is a quality hearing aid which can help you hear the sound clearly and loudly. The volume can be adjusted to 4 different levels.

Features:

Accurate and easy to use
Volume can be adjusted with 4 levels.
Help you hear the sound clearly and loudly, whether indoors or outdoors.
Maximum loudness 130 +/- 5dB.
Sensitivity: >= 50dB.
Frequency range: 300Hz ~ 4000Hz.
Battery Type: AG13 button cell battery (included)
 
Step1: Pair earplug
Choose the earplug as per your ear size
Step2: Equip Battery
Insert the battery according to the positive and negative terminals of the battery
Step3: Start up
Chose battery cover , slide + / - to adjust the volume
Step4: Wear hearing aid
Put the ear hook on the hard of hearing , put the earplug into ear 

The degree of hearing loss level

00-40 dB: normal

41-55 dB: mild to moderate hearing loss (inaudible little voice, face to face short-range loud (normal) speech audible)

56-70 dB: moderate deafness (basically talking loudly on the face of the exchange, the exchange of other cases is very difficult)

71-90 dB: severe hearing loss (basic language can not communicate, you need to talk loudly in the ear can hear a little)

90 db: very severe hearing loss (need ear can only hear the cries of force shout, usually basically silent world)

Hearing aid knowledge

Caution, warning prompt statements
* If you hear howling check earplugs (silicone) size is appropriate, whether plugged,
Choose a suitable each ear, ear canal size and plugged seal, do not leak.
* Not using, please remove the battery to avoid battery decay erosion hearing aid parts.
* Periodically clean earplugs or ear molds to ensure the normal use of hearing aids.
* Shock, drop, moisture, high temperature.

 
Package include:
 
(2 Pack)
Packaging list:
2 x  Hearing Aid
4 x AG13 batteries
6 x Earplug
1 x English instruction manual
OR
(1 Pack)
Packaging list:
1 x hearing aid
3 x Ear Cap
2 x AG13 batteries
1 x English instruction manual