Description :
This digital amplifier can help you get a more clear sound， it is a great item to help people pick a better hearing. Convenient wear
Low noise，low distortion.

The wire plug connected to the headset.Then earplug connector (hard) to the headset.
earbuds (silica gel) to connect to the headphone connector pedestal ?

The battery installation: Gently open the battery compartment cover.
put a AG13/LR44 battery into the battery compartment in the right direction， then close the battery compartment.

Before you use this item， you have to turn the O-N switch to O(off)， and turn the sound volume to minimum.
Then put this item on you ear， keep it tightly.
Next， turn this item on(O-N to N)， adjust the volume until you hear clear sound.
This hearing aid is packaged in a nice retail box which is perfect for retailling.

Specification :
Maximum sound output: 130 ± 5dB?? ?
Sound gain: ≥ 50dB?? ?
Total harmonic distortion: ≤ 5%? ?
Frequency range: 300Hz ~ 40000Hz?? ?
Input Noise: ≤ 30 dB?? ?
Operating voltage: 1.5V?? ?
Battery model LR44
Current: ≤ 4mA
Weight: 74g

Package included :
1 x Digital Tone Hearing Aid
2 x 1.5V Battery
2 x Earplug
1 x Earplug Connector
1 x English User Manual

Details pictures :