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JH-115 Opeartion Manual

Function #

Thank you very much for buying the machine. When you watch a movie, enjoy the drama, attend meeting, or have classes, the product can help you to hear the sound clearly and loudly. While in the forest, if you want to hear a very slight sound, it will be a good choice.
1. Max Sound Output : 130+-5dB
2. Sound Gain: >= 50dB
3. Total harmonic Wave Distortion: <=5%
4. Frequency Range: 300~4000Hz
5. Input Noise: <= 30dB
6. Voltage: D.C. 1.5V
7. Current: <=4mA

Instruction Diagram #

Ear Plug
Please choose Ag3 or A312 Zinc Air Battery.
A Sound collecting Hole
B Volume Adjuster
D Battery Cartridge
E Earphone
F Earplug

“N” means “Power On”
“O” means “Power Off”
“+” Positive electrode of Battery
“-” Negative electrode of Battery
“1~4” Volume grade ,“1” Min,
“4” Max


Open the cartridge cover, put the battery in the correct direction. Zinc-Air Battery is the best choice and has a longer life.
1. Before use, make sure the power is turn off, or make the volume to “1”.
2. Put the ear hook on your ear, plug in the earplug tightly.
(Note: The unit is on”off” position, And volume is on “1”, otherwise the instant sound will make you uncomfortable) .
3. Turn on the power and adjuster the sound volume to get a clear sound.
4. If you hear the whistling sound, please check whether you have plugged in the earplug tightly. If it can’t be plugged tightly, please change the other size plug.
5. When you don’t use it, please open the battery cartridge or take out the battery, otherwise it will continue to work.


No Sound. Check as follow:
1. If you fit the battery in the correct direction.
2. If the battery power has been used up.
3. If the earphone is damaged.
4. If the lead is broken.
the sound is very weak and vague.
1. Battery power isn’t enough.
2.If something is wrong with earphones.
Use a dry cloth and special detergent to clear the unit body.


1. It is forbidden to use by those patients with tympanitis or ear pyogenesis.
2. Don’t use it at a high volume of a long time. Otherwise, it will injure your ear. If you feel uncomfortable, please stop using it.
3. Please maintain the product 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 an environment of humid of high temperature.
5. Don’t throw the scrapped battery as common rubbish, it should be handled by special equipment.
6. Please take out the battery if you 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 product in a potentially explosive or dangerous environment.
8. Keep the unit away from the children. It will injure him or others, or damage the unit.

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