ITEM NAME:Sound Hearing Aid Amplifier Adjustable Tone In Ear For The Hearing Device lj.Harmonic Wave Distortion:≤ 5%. Input Noise: ≤ 30 dB. Max Saturated Sound Pressure: 130dB+5dB. Sound gain: ≥ 50db. Super mini size and light weight, not easily to be seen. Color: as the picture shown. Frequency response Range: 300--- 4000 Hz.
