External Headphones Hearing Aids for Deafness Single Side AAA Batteries Adjustable Noise Reduction Sound Amplifier

1.Max sound output: 15±3dB

2.Sound gain: ≥28dB±2dB

3.Total harmonic wave distortion: ≤7%

4.Frequency range:300-4800MHz

5.Input Noise: ≤29dB

6.Voltage: d.c.1.4V

7.Current: ≤1.2mA

8.Battery:1 x AAA

List:

1 x Host

1 x Headphone cable

4 x Earplugs

1 x English manual

AAA Battery does not include.