RM11546933681726493

 

Rechargeable Hearing Aids Portable Invisible Adjustable 4 Channel Tone Sound Amplifier Behind The Ear For Deaf Elderly Features 1.4 channel digital machine (emphasis) 2. Standard 7 earplugs 3. External moving iron horn (emphasis) Specifications: Grid saturated sound output: 111±2dB High frequency saturation output: 104±3dB Peak gain: 38±4dB High frequency average gain: 32±4dB Equivalent input noise: ≤30dB Working current: ≤2.5mA Total harmonic distortion: ≤6% Frequency response interval: F1≤200Hz, F2≥6500Hz Compression time: ≤100mS Release time: ≤300mS Adaptation range: mild to severe power supply mode: USB charging"