BEST BRASS e-Sax for Alto Saxophone Mute

The photos show everything included.

I bought this when I started learning the saxophone because I didn't have a place to practice making noise.
However, I didn't quite understand how to use it, so I only used it less than 10 times and then stored it at home.

I have never used it with batteries, but I have confirmed that it powers on.

I believe it is in relatively clean condition, but there is some yellowing due to age.

I am not very knowledgeable about this item, so please check the official website for detailed specifications.