3.7 volts 34 decibels.
Portable Hearing Aids for Seniors Rechargeable Hearing Amplifier Charging Case
MEDca Rechargeable Digital Hearing Amplifier - Rechargeable Behind the Ear Personal Hearing Enhancement Sound Amplifier Pair, BTE Digital Hearing Amplifier w/USB Charging Dock by MEDca
Hearing Aid Digital Voice Sound Amplifier Hearing Amplifier w/USB Charging Dock
Hearing Aid for Seniors Hearing Aid Charging Hearing Impaired Sound Amplifier
Digital Hearing Aids for Hearing Loss Hearing Amplifier Portable Charging Case
SANPINTECH Hearing Aids for Seniors for Daily Use,Rechargeable Hearing Amplifier with Noise Cancelling,Adjustable Volume Control,Hearing Aid with Charging Box
