Deafne cancause communication disorders, but also cause dementia, seriously affect their health and quality of life, so we must be vigilant, early prevention, discovery, intervention deafne. New feie behind the ear rechargeable hearing aid C-108 Technical Parameters: 1.New Plug-in hearing aid 2.Rechargeable BTE hearing aid . 3.Lithium battery, 4.Superior sound quality . 5.Special Function Key: O-N-H. 6.Max Out 130 5dB 7.Max Gain 40 5dB 8.Frequency Range: 300~ 4000Hz 9.Harmonic Distortion: 5% 10.Equivalent Noise Input: 30dBSPL 11.Voltage 3.7V 12.Current 4mA 13.Product Weight 18.5g 14.Packing details paper + plastic box 15.Packing Size 16*10*4cm 16.Q.T.Y/Carton 100PCS 17.GW 18kg 18.NW 17kg 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. - Please regularly clean the ear plugs or ear molds in order to ensure the normal use of hearing aids. - Use for long periods of time, please remove the batteries to prevent battery rot erosion hearing aid components. Package Content: 1 x Hearing Aid 3x Earplug(Different Size) 1x EU Charger 1 x Instruction manual ( In English) 1* USB charger cable Sample: Available Delivery within 3 days Warranty: one year