I received this and put in the three random batteries we had. It worked at first, but after 30 seconds it started hissing and only emitting faint "flares" from time to time. I tried new batteries and now it won't turn on or make any noise at all.
Pros
❤Multifunctional Electronic Music Baby Mat: IULONEE baby piano mat with 10 functional piano keys and 8 kinds of musical instruments, each key can produce different melody. You can adjust the volume of the foldable keyboard playmat to choose the right volume for your child.