In addition:If you do not know how to use it or there is a problem with your hearing aid, please do not rush to leave a negative review and contact us. Thank you. Digital hearing aid -G35 Peak Gain (dB): 32dB Frequency range (Hz): 300-3500Hz Equivalent input noise (dB): 25dB -------------------------------------------------------------------------------------- Digital hearing aid -G35 Product parameters: Peak 0SPL 90(dB SPL) ≤105dB+3dB HAF OSPL 90(dB SPL): 102dB4dB Peak Gain (dB): 30dB5dB HAF/FOG gain (dB); 29dB Digital hearing aid with Bluetooth-G37 Product parameters: Peak 0SPL 90(dB SPL) ≤120dB+3dB HAF OSPL 90(dB SPL): 115dB4dB Peak Gain (dB): 30dB5dB HAF/FOG gain (dB); 29dB Frequency range (Hz): 300-5000Hz Equivalent input noise (dB): 32 Digital hearing aid -G17D HAF/FOG Gain (dB) : 30dB Frequency range(Hz) : 300-3800Hz Voltage: D.C.1.5V Charging Time(H):6~8h Battery:Built-in NI-MH Battery hearing aid -G12X HAF/FOG Gain (dB) : 28dB Frequency range(Hz) : 300-5500Hz

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