Sound In-ear Amplifier Adjustable Tone Hearing Aid ‫( New)ضعاف السمع

:

• 1.Max sound output:110±5dB
•  2.Sound gain: ≥30dB
•  3.Total harmonic wave distortion: ≤10%
•  4.Input noise: ≤40dB
•  5.Voltage:d.c.1.5V
•  6.Current: ≤4mA
• 1 unit of ear sound amplifier
• 1 instruction manual
• 3 units of earplug of different size