Digital Hearing Aids Aid Behind the Ear Adjustable

Item Type: Ear Care Brand Name: Happy Shopping Model Number: AD0039 Sound gain: ≥ 50 Harmonic Wave Distortion: ≤ 5% Frequency response Range: 300 --- 4000 Hz Input Noise: ≤ 30 Working Current: ≤ 4mA Power Voltage: 1.5 V