Features:
Rechargeable hearing aid
Built in 400mAh Lithium battery,8 days working time after charge 1 time
Battery charging up to 2000times
DC 3.7V,loud and clear voice
Max sound gain up to 56dB±5dB
LED light indicator
O-H-N swtich(On/Off switch,Low frequency adjustment)
O~4 volume control
Main Unit Size 29*20*80mm
Different size noise prevention earplug for you selection
Use the most splendid lithium battery power supply, provides the battery charger, no need to replace batter

Specifications:
Super long stand by time Hearing aid:
Max Sound Output: 127±4 dB
Max Sound Gain:48dB ± 5dB
Harmonic Wave Distortion:  ≤5%
Frequency Range: 450~3500hz
Input Noise:  ≤32 dB
Battery: Lithium Battery
Working Voltage: dc 3.7V
Working Current: ≤3mA
Net Weight:200g
color box size80.5*28.5*17mm
Special Function Key:Rechargeable

Package included:
1 x Hearing Aid
1 x Charger (110-240v.)
4 x Earplugs
1 x User Instructional Brochure
1 x Earphone

Note:
1.Adjust volume to the minimum before wearing.
2.Choose an earplug of slightly bigger size to avoid whistler.
3.Increase volume gradually to avoid sudden increase in sound.
4.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.
5.Keep the ear plug clean
6.Remove the battery if you don't use