Specification:
Mini BTE Hearing aid
Max Sound Output: 130dB ± 5dB
Max Sound Gain: 50dB ± 5dB
Harmonic Wave Distortion: ≤5%
Frequency Range: 450~3500 hz
Equivalent Input Noise: ≤30 dB
Battery: AG5 button battery (Included)
Working Voltage: D.C.1.5V
Working Current: ≤4mA
Color: As the picture shows
Item Size: 4.6 x 3.8 x 0.9cm
Package Size: 9.4 x 7.2 x 3.2cm
Net Weight: 8g
Feature: Low-frequency noise reduction H file

Package included:
1 x F-136 Hearing aid
3 x Earplug (different sizes)
2 x AG5 button battery
1 x User manual

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.
If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.
Keep the ear plug clean.
Remove the battery if you don't use it for long time.