Mini Hearing aid:
Max Sound Output: ≥120 dB
Max Sound Gain: ≥30 dB
Harmonic Wave Distortion: f<1000Hz≤10%,f>1000Hz≤4%
Frequency Range: 250～3800 Hz
Input Noise: ≤50 dB
Battery: AG3 Button battery (Included)
Working Voltage: dc1.5V
Working Current: ≤4mA
Color: As the picture shows
Item Size: 2.2 x 1.9 x 1.5cm
Package Size: 9.6 x 8.2 x 3.4cm
Net Weight: 4g
1 x K-86 Hearing aid
3 x Earplug (different sizes)
2 x AG3 Button battery
1 x User manual
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.