Thank you for viewing my products ^ ^ This is a waterproof Bluetooth bone conduction earphone ♡ Includes instruction manual and charging adapter. I bought this because I wanted my grandmother, who has become hard of hearing, to be able to hear my children's voices. However, I accidentally bought this instead of a hearing aid, so I am selling it ( ；∀；) Although it is new and unused, I have opened the box to check the contents.