Telephone amplifier

タイトルまたは説明

  It can make the caller's voice enlarge **5 times It is suitable for the different noisy surrounding and Different level hearing impaired person 。        Super strong to resist noise function。 It can be heard clearly under **0db high noisy surrounding and make each other communicate clearly as well!           Easy installation and using。 Just connect with the telephone line that attach the product we offer, install the battery（pls use 2 pcs standard 7# batteries），put down the power，then take up the headphoneit can amplifier!          hearing impaired person and normal person use the transform very simply。       Lightweight and portable，Plug and play，easy using!