Specifications:
BTE Hearing aid:
Max Sound Output: 127±4 dB
Max Sound Gain: 48dB ± 5dB
Harmonic Wave Distortion: ≤5%
Frequency Range: 450~3500 hz
Input Noise: ≤32 dB
Battery: AG13 Button batteries (Included)
Working Voltage: dc1.5V
Working Current: ≤3mA
Color: As the picture shows
Item Size: 4.5 x 4.2 x 1.0cm
Package Size: 12.0 x 7.5 x 3.5cm
Net Weight: 8g

Package included:
1 x V-185 Hearing aid
6 x Earplug (different sizes)
2 x button cell battery
1 x User manual
1 x Box

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.