Features:
Brand new and high quality invisible hearing aid sound amplifier
Super mini size and light weight, not easily to be seen
Adjust volume to the minimum before wearing
Increase volume gradually to avoid sudden increase in sound
Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly

Specification:
Mini ITE Hearing aid
Max Sound Output: ≥110 dB ± 5dB
Max Sound Gain: ≥30 dB ± 5dB
Frequency Range: 300～4000Hz
Input Noise: ≤40 dB
Battery: A10 Button battery (included)
Working Voltage: dc1.5V
Working Current: ≤3mA
Color: As the picture shows

Package included:
1 x K-188 Hearing aid
3 x Earplug (different sizes)
2 x A10 Button battery
1 x User manual
1 x Box
1 x tool
About Whistle, you can do this 3 steps to remove it.
1. Choose a suitable earplug to make the product sealed in the ear canal
2. Low down the sound volume
3. When you put into battery , please be quick , to put the product into the ear
Note:
Adjust volume to the minimum before wearing.
Choose an earplug of slightly bigger size to avoid whistler.
Increase volume gradually to avoid sudden increase in sound.
Keep the ear plug clean.
Remove the battery if you don't use it for long time.

“请仔细阅读产品说明书或者在医务人员的指导下购买和使用”。