Bluetooth Audio Transmitter from 3.5 Audio Jack

I have an android TV box with no Bluetooth, installing Bluetooth dongles to it does not work, So i got a nice little Bluetooth transmitter that receives audio from a regular headphones jack, and transmits it to a Bluetooth speaker ! the YET-TX9 (Amazon for $19 but i have my doubts it is the best option)

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There is no user’s manual inside, the instructions are, as you can see, printed on the box.

Will come here and add the details as soon as i try it out