Pillow with built-in speaker to play music.
Sounds from the speaker can be heard only by a person lying on the pillow.
You can control the easily sound level from the music source, e.g. a smartphone.
The speaker in a pillow is not perceptible, and you will sleep soundly.
It does not require an additional power supply. It has a 3,5 mm plug (mini-jack - standard for all music players).
