Adult Mini Digital Hearing Aids Invisible Ear Adjustable Voice Sound Amplifier

1pc or 2pcs Hearing aid. Color: Skin tone. Equivalent input noise level: ≤29dB+3dB. Output sound pressure level (high-frequency average) : 110dB±4dB. 3 full sound gain (maximum gain) : 35dB±5dB. Full sound gain (average gain) : 30dB±5dB.