Specifications:


Max saturated audio output 133±5 dB
Full audio gain (1000Hz) 48±5 dB
Harmonic distortion ≤8%
Equivalent input noise ≤30 dB


Pack including:
1 x Convenient XM-999E Voice Amlifier Hearing Aids
1 x manual
1 x wiring
1 x earphone
3 x Earplug (different sizes)



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.