New Best Digital Tone Hearing Aids Aid Behind The Ear Sound Amplifier Adjustable

Specification:

• Convenient wear Low noise, low distortion;
• For people with severe hearing loss;
• Product use hearing assistive devices.
• The scope of application of gas conduction hearing disorders.
• Taboos otitis media or ear suppuration who are disabled.

Features:

• Maximum sound output: 130 +_ 5dB
• Sound gain: more than 50dB
• Total harmonic distortion: less than 5%
• Frequency range: 300Hz ~ 40000Hz
• Input Noise: less than 30 dB
• Operating voltage: 1.5V
• Battery model LR44
• Current: less than 4mA
• Weight: 74g

 Before you use this item ,you have to turn the O-N switch to O(off),and turn the sound volume to minimum Then put this item on you ear, keep it tightly Next, turn this item on(O-N to N), adjust the volume until you hear clear sound