Rechargeable Hearing Aid Hearing Device Digital Sound Amplifier for Deafness Audifonos Hearing Aid for Elderly Rechargeable
Product Features: * Mini size--Invisible to wear * Easy to operate for elderly * Digital chips, Noise reduction * Rechargeable--no need to replace battery * Around 25 Hours to use after fully charged Product parameters: Size: 21.7x15x21.9mm Working voltage: DC 3.7V +5%, -10% Working current: ≤ 1.4mA Frequency response: 300-5000 Hz Equivalent Input Noise: ≤29dB, +3dB Maximum Saturation Acoustic Output: ≤128dB, +3dB Here is the Tips, if there is the beeps and whistle,try the following way: 1.Please adjust lower volume . 2.Choose the suitable ear plug 3.Make sure if you put the earplug tightly,sound leak will make the Whistle.Securely position the instrument into your ear. Once the hearing aid is properly seated in your ear,the whistling will generally stop.